SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K


                             CURRENT REPORT PURSUANT
                          TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


         Date of Report (Date of earliest event reported): May 26, 1999

                                TSI INCORPORATED
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)


                                    MINNESOTA
                 ----------------------------------------------
                 (State or other jurisdiction of incorporation)



         0-2958                                          41-0843524
- ------------------------                      ---------------------------------
(Commission File Number)                      (IRS Employer Identification No.)



500 CARDIGAN ROAD, SHOREVIEW,  MINNESOTA                  55126
- ----------------------------------------               ----------
(Address of principal executive offices)               (Zip Code)



Registrant's telephone number, including area code:           (651) 483-0900
                                                              --------------



                                       N/A
          -------------------------------------------------------------
          (Former name or former address, if changed since last report)







ITEM 2. ACQUISITION OR DISPOSTION OF ASSETS

Pursuant to the Agreement and Plan of Merger dated May 11, 1999, which is
attached hereto as an exhibit, Registrant, on June 1, 1999, purchased the stock
of Environmental Systems Corporation (a Tennessee Corporation). The closing took
place on May 26, 1999. Environmental Systems Corporation (ESC) specializes in
technology-based products and services relating to environmental monitoring,
power production, and waste management. In its fiscal year ended December 31,
1998, sales were approximately $22.9 million. ESC is headquartered in Knoxville,
Tennessee, with subsidiaries in eastern Europe and Asia.

The acquisition price of $25,000,000 was paid in cash. The consideration paid
was determined by arms-length negotiations between Registrant and Environmental
Systems Corporation. No prior relationships existed between Registrant and
Environmental Systems Corporation or their shareholders, directors, officers,
and associates. To finance the acquisition, the Registrant used its existing
cash along with bank financing of approximately $15,000,000 made available under
a credit agreement with U.S. Bank of Minneapolis, MN. The initial term of the
debt will be short-term with the ability to extend the term for periods not to
exceed five years. The interest rate on the debt is the lesser of either the
reference rate or approximately 1.2% over the CD rate or Eurodollar rate.

The acquisition will be accounted for by the purchase method of accounting. The
amount of the purchase price that exceeded the fair market value of identified
assets will be allocated to goodwill that will be amortized over twenty years.

Registrant intends to continue the business previously conducted by
Environmental Systems Corporation substantially similar as before Registrant's
acquisition.

The description contained in this 8-K and in the press release attached hereto
as Exhibit 99 does not purport to be complete and is qualified in its entirety
by reference to the Merger Agreement, a copy of which is attached hereto as
Exhibit 2 and is incorporated by reference herein.


ITEM 7. FINANCIAL STATEMENTS, PROFORMA FINANCIAL INFORMATION AND EXHIBITS

        The following financial information is being filed in order to satisfy
the financial statement information requirement for this report.

         (a)      Financial Statements of Environmental Systems Corporation
                  (ESC)

                           Report of Independent Auditors

                           Consolidated Balance Sheets as of December 31, 1998
                           and 1997 (Audited) and March 31, 1999 (Unaudited)

                           Consolidated Statements of Income for the Years Ended
                           December 31, 1998 and 1997 (Audited) and for the
                           Three Months Ended March 31, 1999 and 1998
                           (Unaudited)

                           Consolidated Statements of Shareholders' Equity for
                           the Years Ended December 31, 1998 and 1997 (Audited)

                           Consolidated Statements of Cash Flows for the Years
                           Ended December 31, 1998, and 1997 (Audited) and for
                           the Three Months Ended March 31, 1999 and 1998
                           (Unaudited)

                           Notes to Financial Statements

         (b)      Pro Forma Financial Information



                                       2


                           Description of the Unaudited Pro Forma Combined
                           Financial Information of ESC and TSI Incorporated.

                           Unaudited Pro Forma Condensed Combined Statement of
                           Operations for the Year Ended March 31, 1999,
                           including notes to pro forma statement of operations.

                           Unaudited Pro Forma Condensed Balance Sheet as of
                           March 31, 1999, including notes to pro forma balance
                           sheet.

         (c)      Exhibits

         2        Agreement and Plan of Merger dated May 11, 1999, between TSI
                  Incorporated, TSI Tennessee, Inc. and Environmental Systems
                  Corporation.

         23       Consent of Independent Auditors

         99       Press release disclosing the execution of the merger agreement

         Information contained herein may contain forward looking statements
         that involve risks and uncertainties with respect to the fair value of
         assets acquired, the amount of liabilities assumed, the allocation of
         the purchase price to the tangible and intangible assets acquired, and
         otherwise. These forward looking statements include the words
         "believes", "expects", "anticipates" and similar expressions. These
         forward looking statements involve certain risks and uncertainties,
         including those related to general economic and business conditions,
         changes in market conditions and competitive pressures. In addition,
         the purchase price allocation includes preliminary estimates based upon
         TSI's initial review of the assets and liabilities acquired. The final
         allocation of the purchase price will be based in part on an
         independent valuation. There can be no assurance that the final
         purchase price allocation will be consistent with the allocation
         reflected in the accompanying unaudited pro forma combined financial
         information.







                                       3






                                   SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on behalf of the
undersigned thereunto duly authorized.


Dated:   June 10, 1999
                                              TSI INCORPORATED


                                              By    /s/ James E. Doubles
                                                -------------------------------
                                                        James E. Doubles
                                                        Chief Executive Officer



                                       4



         Item 7(a)  Financial Statements of Business Acquired


         Report of Independent Auditors

         Board of Directors
         Environmental Systems Corporation

         We have audited the accompanying consolidated balance sheets of
         Environmental Systems Corporation and subsidiaries as of December 31,
         1998 and 1997, and the related consolidated statements of income,
         shareholders' equity and cash flows for the years then ended. These
         financial statements are the responsibility of the Company's
         management. Our responsibility is to express an opinion on these
         financial statements based on our audits. We did not audit the
         financial statements of ECM ECO Monitoring, a.s., or ECM ECO Monitoring
         (Thailand) Co., Ltd., majority-owned subsidiaries, which statements
         reflect total assets of $1,587,930 and $2,051,036 and total liabilities
         of $777,830 and $1,259,574 as of December 31, 1998 and 1997,
         respectively, and total revenues of $3,319,493 and $2,612,131
         respectively, for the years then ended. Those statements were audited
         by other auditors whose report has been furnished to us, and our
         opinion, insofar as it relates to data included for ECM ECO Monitoring,
         a.s., and ECM ECO Monitoring (Thailand) Co., Ltd., is based solely on
         the report of the other auditors.

         We conducted our audits in accordance with generally accepted auditing
         standards. Those standards require that we plan and perform the audit
         to obtain reasonable assurance about whether the financial statements
         are free of material misstatement. An audit includes examining, on a
         test basis, evidence supporting the amounts and disclosures in the
         financial statements. An audit also includes assessing the accounting
         principles used and significant estimates made by management, as well
         as evaluating the overall financial statement presentation. We believe
         that our audits and the report of other auditors provide a reasonable
         basis for our opinion.

         In our opinion, based on our audits and the report of other auditors,
         the consolidated financial statements referred to above present fairly,
         in all material respects, the financial position of Environmental
         Systems Corporation and subsidiaries at December 31, 1998 and 1997, and
         the results of their operations and their cash flows for the years
         ended in conformity with generally accepted accounting principles.

                                            /s/ Coulter & Justus, P.C.

         February 25, 1999, except for
             Note 11, as to which the
               date is May 12, 1999



                                       5





ENVIRONMENTAL SYSTEMS CORPORATION
CONSOLIDATED BALANCE SHEETS (ALL #S ROUNDED TO NEAREST THOUSAND)



                                                                     DECEMBER 31,          DECEMBER 31,        MARCH 31,
                                                                         1998                 1997               1999
                                                                 -----------------------------------------------------------
                                                                                                              (Unaudited)
                                                                                                   
ASSETS
Current assets:
   Cash and cash equivalents                                        $    2,778,000       $    3,978,000     $    3,360,000
   Trade accounts and notes receivable, less allowance
     For uncollectible accounts of $607,000 in 1998
     and $514,000 in 1997 and $607,000 in 1999                           4,777,000            4,376,000          5,269,000
   Other receivables                                                        97,000               84,000
   Refundable income taxes                                                 107,000                    -                  -
                                                                                                                         -
   Costs and estimated earnings in excess of billings
     on uncompleted contracts                                            1,345,000              851,000          1,190,000
   Total inventories                                                       930,000              996,000          1,175,000
   Deferred income taxes                                                   390,000              367,000            390,000
   Prepaid expenses and other current assets                                29,000               42,000            176,000
                                                                            ------               ------            -------
Total current assets                                                    10,453,000           10,694,000         11,560,000
                                                                        ----------           ----------         ----------

Property, Plant and Equipment
   Land                                                                    651,000              651,000            651,000
   Buildings and improvements                                            2,281,000            1,104,000          2,281,000
   Technical equipment                                                   2,670,000            2,397,000          2,756,000
   Car and trucks                                                          244,000              129,000            262,000
   Office equipment                                                      1,277,000            1,006,000          1,253,000
   Leasehold improvements                                                   32,000               30,000             27,000
   Construction in progress                                                144,000            1,184,000            151,000
                                                                           -------            ---------            -------
                                                                         7,299,000            6,501,000          7,381,000
                                                                         ---------            ---------          ---------
   Less allowances for depreciation and amortization                    (2,436,000)          (1,830,000)        (2,558,000)
                                                                        ----------           ----------         ----------
Net property, plant and equipment                                        4,863,000            4,671,000          4,823,000

Note receivable                                                            225,000              225,000            225,000
Other assets                                                               156,000              410,000            125,000
                                                                           -------              -------            -------
Total assets                                                           $15,697,000          $16,000,000        $16,733,000
                                                                       ===========          ===========        ===========

LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
   Trade accounts payable                                           $    1,177,000       $    1,339,000     $    1,050,000
   Billings in excess of costs and estimated earnings
     on uncompleted contracts                                            3,332,000            4,979,000          3,469,000
   Accrued compensation                                                  1,117,000            1,088,000            185,000
   Income tax payable                                                            -              189,000                  -
   Other accrued expenses                                                  276,000              340,000          1,671,000
   Current portion of long-term debt                                       153,000              153,000            153,000
                                                                           -------              -------            -------
Total current liabilities                                                6,055,000            8,088,000          6,528,000
Other liabilities:
   Deferred income taxes                                                   160,000              207,000            160,000
   Long-term debt, less current portion                                  1,840,000            2,032,000          1,840,000
   Minority interests in subsidiaries                                      241,000              227,000            241,000
                                                                           -------              -------            -------
Total other liabilities                                                  2,241,000            2,466,000          2,241,000
                                                                         ---------            ---------          ---------





                                       6




                                                                                                        
Total liabilities                                                        8,296,000           10,554,000          8,769,000
                                                                         ---------           ----------          ---------

Shareholders' equity:
   Common stock, no par value:
     Authorized shares--5,000,000
     Issued and outstanding shares--1,606,092                              528,000              528,000            534,000
   Retained earnings                                                     7,010,000            5,084,000          7,567,000
   Accumulated other comprehensive income--foreign
     currency translation adjustments                                     (137,000)            (166,000)          (137,000)
                                                                          --------             --------           --------
Total shareholders' equity                                               7,401,000            5,446,000          7,964,000
                                                                         ---------            ---------          ---------
Total liabilities and shareholders' equity                             $15,697,000          $16,000,000        $16,733,000
                                                                       ===========          ===========        ===========






ENVIRONMENTAL SYSTEMS CORPORATION
CONSOLIDATED STATEMENTS OF INCOME (ALL #s ROUNDED TO NEAREST THOUSAND)



                                                                    YEAR ENDED                        THREE MONTHS ENDED
                                                      -----------------------------------------------------------------------
                                                           DECEMBER 31,      DECEMBER 31,          MARCH 31,       MARCH 31,
                                                              1998              1997                 1999           1998
                                                      ------------------------------------  ---------------------------------
                                                                                                  (Unaudited)     (Unaudited)
                                                                                                       
Revenues:
   Operating revenues                                      $22,901,000        $19,372,000         $5,311,000       $4,959,000
   Interest and other income                                   249,000            803,000             27,000           41,000
                                                      ------------------------------------  ---------------------------------
Total revenues                                              23,150,000         20,175,000          5,338,000        5,000,000

Costs and expenses:
   Operating                                                12,418,000          9,792,000          2,409,000        2,370,000
   General and administrative                                6,795,000          5,677,000          1,861,000        1,603,000
   Research and development                                    961,000            870,000            225,000          209,000
                                                      ------------------------------------  ---------------------------------
Total costs and expenses                                    20,174,000         16,339,000          4,495,000        4,182,000
                                                      ------------------------------------  ---------------------------------

Income before income taxes and minority interest
   in earnings of consolidated subsidiaries                  2,976,000          3,836,000            843,000          818,000

Provision for income taxes                                   1,042,000          1,249,000            287,000          278,000
                                                      ------------------------------------  ---------------------------------

Income before minority interest in earnings of
   consolidated subsidiaries                                 1,934,000          2,587,000            556,000          540,000

Minority interest in earnings of consolidated                   (8,000)           (36,000)                 -                -
   subsidiaries
                                                      -----------------------------------------------------------------------

Net income                                             $     1,926,000    $     2,551,000    $       556,000  $      540,000
                                                      ====================================  =================================





                                       7






ENVIRONMENTAL SYSTEMS CORPORATION
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY  (ALL #s ROUNDED TO NEAREST
THOUSAND)



                                                                                                 ACCUMULATED
                                                                                                   OTHER
                                                             COMMON            RETAINED        COMPREHENSIVE
                                                              STOCK            EARNINGS            INCOME              TOTAL
                                                           ------------------------------------------------------------------------

                                                                                                        
Balance at January 1, 1997                                    $923,000           $5,529,000         $  (12,000)        $6,440,000
   Purchase and retirement of 1,395,463 shares
     of common stock held by ESOP                             (395,000)          (2,996,000)                 -         (3,391,000)
   Comprehensive income:
     Net income                                                      -            2,551,000                  -          2,551,000
     Foreign currency translation adjustments                        -                    -           (154,000)          (154,000)
                                                                                                                 ------------------
   Net comprehensive income                                                                                             2,397,000
                                                           ------------------------------------------------------------------------
Balance at December 31, 1997                                   528,000            5,084,000           (167,000)         5,446,000
   Comprehensive income:
     Net income                                                      -            1,926,000                  -          1,926,000
     Foreign currency translation adjustments                        -                    -             30,000             30,000
                                                                                                                 ------------------
   Net comprehensive income                                                                                             1,955,000
                                                           ------------------------------------------------------------------------
Balance at December 31, 1998                                  $528,000           $7,010,000          $(137,000)        $7,401,000
                                                           ========================================================================






ENVIRONMENTAL SYSTEMS CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS (ALL #s ROUNDED TO NEAREST THOUSAND)



                                                                       YEAR ENDED                        THREE MONTHS ENDED
                                                                       DECEMBER 31                            MARCH 31,
                                                                 1998              1997              1999                1998
                                                          ------------------------------------------------------------------------
                                                                                                     (UNAUDITED)       (UNAUDITED)
                                                                                                             
OPERATING ACTIVITIES
Net income                                                      $1,926,000         $2,551,000          $556,000          $540,000
Adjustments to reconcile net income to net cash
   provided by (used in) operating activities:
     Depreciation and amortization                                 889,000            398,000           122,000            95,000
     Provision for deferred income taxes (benefit)                 (70,000)           (67,000)                -                 -
     Gain on sale of investment                                          -           (254,000)                -                 -
     (Gain) loss on disposal of equipment and improvements          (1,000)             3,000                 -                 -
     Provision for losses on accounts receivable                   108,000             85,000                 -                 -
     Changes in operating assets and liabilities, net of effects
       of acquisition:
         Receivables                                              (535,000)          (261,000)         (289,000)          197,000
         Refundable income taxes                                  (107,000)                 -
         Inventories                                                53,000           (297,000)         (244,000)         (279,000)
         Costs and estimated earnings in excess of
           billings on uncompleted contracts                      (494,000)          (390,000)          155,000           200,000
         Other assets                                               22,000           (164,000)         (116,000)          989,000
         Trade accounts payable                                   (150,000)           254,000          (127,000)         (244,000)
         Billings in excess of costs and estimated
           earnings on uncompleted contracts                    (1,649,000)          (747,000)          137,000          (422,000)



                                       8





                                                                                                              
         Accrued compensation                                       30,000            303,000          (932,000)          107,000
         Income taxes payable                                     (189,000)          (127,000)                -                 -
         Minority interest in subsidiary                            15,000            (31,000)                -                 -
         Other liabilities                                         (66,000)            68,000         1,396,000          (906,000)
                                                          --------------------------------------------------------------------------
Net cash provided by (used in) operating activities               (218,000)         1,325,000           658,000           277,000

FINANCING ACTIVITIES
Proceeds of stock options exercised                                      -                                6,000                 -
Purchase of common stock held by ESOP                                    -         (3,391,000)                -                 -
Principal payments on long-term debt                              (192,000)          (115,000)                -           (46,000)
                                                          --------------------------------------------------------------------------
Net cash used in financing activities                             (192,000)        (3,506,000)            6,000           (46,000)

INVESTING ACTIVITIES
Cash restricted for buildings                                                       2,300,000                 -                 -
Proceeds from sale of investment                                         -            284,000                 -                 -
Issuance of note receivable                                              -           (225,000)                -                 -
Proceeds from sales of property, plant and equipment                 4,000             65,000                 -                 -
Purchases of property, plant and equipment                        (837,000)        (3,205,000)          (82,000)         (221,000)
Purchase of Southern Testing Services, Inc.                              -           (588,000)                -                 -
                                                          --------------------------------------------------------------------------
Net cash used in investing activities                             (833,000)        (1,370,000)          (82,000)         (221,000)

Effect of exchange rate changes on cash and
   cash equivalents                                                 43,000             (7,000)                -                 -
                                                          --------------------------------------------------------------------------
Net decrease in cash and cash equivalents                       (1,200,000)        (3,558,000)          582,000            10,000
Cash and cash equivalents at beginning of year                   3,978,000          7,536,000         2,778,000         3,978,000
                                                          --------------------------------------------------------------------------

Cash and cash equivalents at end of year                        $2,778,000         $3,978,000        $3,360,000        $3,988,000
                                                          ==========================================================================


                SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION

Cash paid during the year for:
     Interest                                         $  118,000  $  100,000
     Income taxes                                      1,407,000   1,474,000





Environmental Systems Corporation

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 1998


1.       Significant Accounting Policies


PRINCIPLES OF CONSOLIDATION
The accompanying consolidated financial statements include the accounts of
Environmental Systems Corporation ("the Company") and its majority-owned
subsidiaries. All significant intercompany accounts and transactions have been
eliminated in consolidation. Net income (loss) from a majority-owned Slovakian
subsidiary, ECM ECO Monitoring, a.s. ("ECM"), included in the consolidated
statements of income totaled $63,000 for 1998 and $176,000 for 1997. Net loss
from a majority-owned subsidiary in Thailand, ECM ECO Monitoring (Thailand) Co.,
Ltd. ("ECM-Thailand"), included in the consolidated statement of income totaled
$(83,000) in 1998 and $(25,000) in 1997.



                                       9


USE OF ESTIMATES
The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect certain reported amounts and disclosures. Accordingly, actual results
could differ from those estimates.

MINORITY INTEREST
Minority interest represents the minority shareholders' proportionate share of
the equity and the income or loss of certain consolidated subsidiaries,
primarily ECM and ECM-Thailand. The Company owns 70% of the outstanding shares
of ECM and 78.8% of the outstanding shares of ECM-Thailand. ECM also owns the
majority interest in certain other consolidated subsidiaries.

The Company also owns 100% of the outstanding shares of Waste Conversion
Systems, Inc. ("WCS"). During October 1997, WCS purchased 100% of the
outstanding shares of Southern Testing Services, Inc. ("STS"). This acquisition
was accounted for by the purchase method; therefore, results of STS operations
were included in the financial statements beginning on the date of acquisition.
The purchase price of $588,000 was allocated to accounts receivable of
$244,000, technical equipment of $644,000, liabilities assumed of $55,000 and
deferred income tax liabilities of $244,000.

FOREIGN CURRENCY TRANSLATION
In accordance with Statement of Financial Accounting Standards No. 52, "Foreign
Currency Translation," the financial statements of ECM and ECM-Thailand are
translated using exchange rates in effect at year-end for assets and liabilities
and average exchange rates during the year for results of operations. The
related translation adjustments are reported as a separate component of
shareholders' equity.

INDUSTRY
The Company is engaged in providing services and systems and in the design,
manufacturing and marketing of environmental monitoring devices for large
utilities and governmental agencies and, therefore, generally does not require
collateral for receivables.

INTERIM FINANCIAL STATEMENTS
The accompanying unaudited financial statements as of March 31, 1999 and for the
three months ended March 31, 1999 and 1998 have been prepared in accordance with
generally accepted accounting principles for interim financial information.
Accordingly, they do not include all of the disclosures required by generally
accepted accounting principles for complete financial statements. In the opinion
of management, all adjustments considered necessary for a fair presentation have
been included. Results for interim periods are not necessarily indicative of
results for the entire year.

EQUIPMENT AND IMPROVEMENTS
Equipment and improvements are stated at cost. The Company computes depreciation
principally by the straight-line method over the estimated useful lives of the
assets.

REVENUES
The Company recognizes revenues from contracts under the
percentage-of-completion method, measured by the percentage of costs incurred to
date to estimated total costs for each contract. This method is used because
management considers it to be the best available measure of progress on the
contracts. Because of inherent uncertainties in estimating costs, it is at least
reasonably possible that the estimates used will change within the near term.
Contract costs include all direct material and labor costs and those indirect
costs related to contract performance, such as indirect labor and supplies.
Selling, general and administrative costs are charged to expense as incurred.
Provisions for estimated losses on uncompleted contracts are made in the period
in which such losses are determined. Changes in job performance, job conditions
and estimated profitability, including those arising from contract penalty
provisions, and final contract settlements may result in revisions to costs and
income and are recognized in the period in which the revisions are determined.




                                       10


The asset, "costs and estimated earnings in excess of billings on uncompleted
contracts," represents revenues recognized in excess of amounts billed. The
liability, "billings in excess of costs and estimated earnings on uncompleted
contracts," represents billings in excess of revenues recognized.

INVENTORIES
Inventories are stated at the lower of average cost or market. Inventories
consisted of the following:

                               December 31, 1998       December 31, 1997
         Supplies                  $213,000                $222,000
         Work in Process            423,000                 500,000
         Finished Goods             294,000                 274,000
                                    -------                --------
                                   $930,000                $996,000

RESEARCH AND DEVELOPMENT COSTS
Research and development costs are expensed as incurred.

CASH EQUIVALENTS
The Company considers all highly liquid investments with a maturity of three
months or less when purchased to be cash equivalents.



2.       Income Taxes

Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax assets and liabilities are as follows:



                                                                                        DECEMBER 31
                                                                                  1998                1997
                                                                          -----------------------------------------

                                                                                                 
         Deferred tax assets:
           Allowance for accounts receivable                                      $196,000             $163,000
           Vacation accruals                                                       173,000              151,000
           Warranty reserves                                                        28,000               62,000
           Other                                                                    89,000               75,000
                                                                          -----------------------------------------
         Total deferred tax assets                                                 486,000              451,000

         Deferred tax liabilities:
           Tax over book depreciation                                              249,000              282,000
           Prepaid expenses deducted for tax purposes                                7,000                9,000
                                                                          -----------------------------------------
         Total deferred tax liabilities                                            256,000              291,000
                                                                          -----------------------------------------
         Net deferred tax assets, including $390,000 in 1998 and
           $367,000 in 1997 classified as current
                                                                                  $230,000             $160,000
                                                                          =========================================


Significant components of the provision for income tax expense (benefit) are as
follows:



                                                                                  1998                1997
                                                                          ----------------------------------------
                                                                                               
         Current:
           Federal                                                              $1,045,000           $1,207,000
           State                                                                    67,000              109,000
                                                                          ----------------------------------------
         Total current                                                           1,112,000            1,316,000
         Deferred:




                                       11



                                                                                                  
           Federal                                                                 (63,000)             (60,000)
           State                                                                    (7,000)              (7,000)
                                                                          ----------------------------------------
         Total deferred                                                            (70,000)             (67,000)
                                                                          ----------------------------------------
         Total income tax expense                                               $1,042,000           $1,249,000
                                                                          ========================================


The reconciliation of income taxes computed at the U.S. federal statutory tax
rates to income tax expense is:



                                                                                  1998                1997
                                                                          ----------------------------------------

                                                                                                
         Tax at U.S. statutory rates                                             $1,012,000           $1,304,000
         State income taxes, net of federal tax benefit                              60,000              102,000
         Difference in taxes on ECM and ECM-Thailand operations
                                                                                     10,000              (56,000)
         Other (net)                                                                (39,000)            (101,000)
                                                                          ----------------------------------------
         Total income tax expense                                                $1,042,000           $1,249,000
                                                                          ========================================


Cumulative undistributed earnings of ECM amounted to approximately $424,000 and
$362,000 at December 31, 1998 and 1997, respectively. Those earnings are
considered to be indefinitely reinvested and, accordingly, no provision for U.S.
federal and state income taxes has been provided thereon. Upon distribution of
those earnings in the form of dividends or otherwise, the Company would be
subject to both U.S. income taxes (subject to an adjustment for foreign tax
credits) and withholding taxes payable to the foreign country. Determination of
the amount of unrecognized deferred U.S. income tax liability is not practicable
because of the complexities associated with its hypothetical calculation.

3.       Stock Option Plan

The Company has a non-qualified stock option plan which provides for the
granting of options to key employees and non-employee directors of the Company.
The aggregate number of shares of common stock reserved for issuance under the
plan is 630,000 shares. The option price, number of shares, grant date and
vesting period are determined at the discretion of the Company's board of
directors. Options granted under the plan are exercisable for a period not to
exceed five years from the option grant date. The option price approximates the
fair value of the options at the grant date. A summary of option transactions
during 1998 and 1997 is as follows:



                                                                          NUMBER               WEIGHTED AVERAGE
                                                                         OF SHARES              EXERCISE PRICE
                                                                  ---------------------------------------------------

                                                                                             
         Outstanding at January 1, 1997                                     395,000                 $1.54
           Granted                                                           60,000                 $2.43
           Canceled                                                         (30,000)                $1.54
                                                                  ------------------------
         Outstanding at December 31, 1997                                   425,000                 $1.67
           Granted                                                           20,000                 $3.50
                                                                  ------------------------
         Outstanding at December 31, 1998                                   445,000                 $1.75
                                                                  ========================

         Exercisable at December 31, 1998                                   145,000                 $1.60
                                                                  ========================

         Available for issuance at December 31, 1998                         35,000
                                                                  ========================



A summary of options outstanding as of December 31, 1998, is as follows:



              EXERCISE                NUMBER OF                 REMAINING                 NUMBER OF
               PRICE              SHARES OUTSTANDING               LIFE              SHARES EXERCISABLE
        -----------------------------------------------------------------------------------------------------

                                                                                  
               $1.54                       270,000              1.58 YEARS                  135,000



                                       12



                                                                                  
               $1.54                        95,000              2.58 YEARS                        -
               $2.43                        60,000              3.42 YEARS                   10,000
               $3.50                        20,000              4.83 YEARS                        -
                             -----------------------------
                                           445,000
                             =============================



4.       Employee Stock Ownership Plan

During 1993, the Company established a leveraged employee stock ownership plan
(ESOP) that covered substantially all employees and bought 1,395,463 shares of
common stock from existing shareholders. The Company accrued annual
contributions to the ESOP equal to the ESOP's debt service, along with
additional amounts determined by the Board of Directors. During 1997, the
Company terminated the ESOP by purchasing and retiring the ESOP shares based on
an independent stock valuation. The value of participant accounts were then
transferred to the Company's profit sharing retirement plan.

5.       Profit Sharing Retirement Plan

The Company has a profit sharing plan covering substantially all employees.
Under the terms of the Plan, the Company's contribution is determined each year
by the Board of Directors. Profit sharing contributions accrued totaled $64,000
in 1998 and $66,000 in 1997.

6.       Leases

The Company leases office facilities and general storage facilities under
short-term operating leases. Net rent expense for all operating leases,
including facilities and short-term equipment leases, was as $128,000 in 1998
and $339,000 in 1997.


7.       Notes Payable and Long-Term Debt

Long-term debt consists of the following:



                                                                                         DECEMBER 31
                                                                                   1998                  1997
                                                                         --------------------------------------------

                                                                                             
       Industrial Revenue Bonds (Series 1996A and B)                            $1,993,000            $2,185,000
       Less current portion                                                        153,000               153,000
                                                                         --------------------------------------------
       Long-term portion                                                        $1,840,000            $2,032,000
                                                                         ============================================


In December 1996, the Company entered into a loan agreement whereby the Company
received $2,300,000 of the proceeds of Industrial Revenue Bonds issued by the
Industrial Development Board of Knox County, Tennessee. $900,000 in tax-exempt
bonds (the "Series 1996 A Bonds") were used to finance the acquisition,
construction and equipping of a manufacturing facility. $1,400,000 in taxable
bonds (the "Series 1996 B Bonds") were for the purpose of acquiring the office
facility and constructing certain improvements. The Bonds were issued pursuant
to an Indenture of Trust between the Industrial Development Board and First
American National Bank, as Trustee. The loan agreement related to the Bonds is
collateralized by an irrevocable letter of credit issued by a bank ("the
Trustee") for $2,236,000 which expires in December 1999.

The Bonds are remarketed on a weekly basis and bear interest at a variable rate
which cannot exceed the lesser of 12% or the maximum rate allowed by law. The
rate was 4.2% and 5.4% as of December 31, 1998, for the Series 1996 A Bonds and
Series 1996 B Bonds, respectively. The Company has the option to convert to a
fixed interest rate until maturity of the Bonds at the lower of the maximum rate
allowed or at the rate determined by the remarketing agent in accordance



                                       13


with the Indenture of Trust. Conversion from the variable rate requires a
mandatory tender offer to all current holders of the Bonds.

During the variable rate period, any holder of the Bonds may, subject to the
terms of the Indenture of Trust, require the repurchase of all or a portion of
the Bonds at a price equal to the principal amount of the Bonds plus accrued
interest. The Indenture of Trust allows the Trustee to draw upon the letter of
credit for payment of any Bonds not remarketed. The interest rate on the letter
of credit draws is the bank's index rate plus 2%. The Reimbursement Agreement is
collateralized by the land and assignment of future construction.

The Bonds are also subject to optional redemptions at the direction of the
Company. Mandatory redemption is required upon determination of taxability or on
the termination date of the letter of credit at 100% plus accrued interest.
Prior to conversion to a fixed rate, the Bonds may be redeemed during the weekly
rate period on any adjustment date or on any conversion date at 100% of
principal plus accrued interest. If converted to a fixed rate, the Bonds may be
redeemed at redemption prices ranging from 100% to 102% of principal plus
accrued interest based upon the date of redemption. The Reimbursement Agreement
requires quarterly payments to a trust account with the Bank for the purpose of
making optional redemptions of the Bonds. The required future payments as of
December 31, 1998, are summarized as follows:

               1999                          $  153,000
               2000                             153,000
               2001                             153,000
               2002                             153,000
               2003                             153,000
               Thereafter                     1,227,000
                                             ----------
                                             $1,993,000
                                             ==========

The Reimbursement Agreement also requires the payments to the Trust account be
used to make optional redemptions of the Bonds at least annually in increments
of $100,000. Principal payments of $192,000 in 1998 and $115,000 in 1997 were
paid to the trust for the Series B Bonds which is held until the Trustee
authorizes redemption of the bonds. As these payments have been made, the debt
outstanding has been reduced accordingly.

As of December 31, 1998, the Company also has an unused $2,000,000 revolving
line of credit, which expires in June 2000, and an unused $500,000 equipment
line of credit, which expires in June 1999. Interest at the bank's base rate
less 0.82% is payable monthly on any portion of the lines of credit utilized. As
of December 31, 1998, $529,772 of the revolving line of credit secures unused
$530,000 letters of credit with a bank which expire on various dates through
November 1999. The lines of credit are covered under a loan agreement which
requires the Company to, among other things, meet certain financial covenants
and not pay any dividends.

Interest expense was $118,000 in 1998 and $100,000 in 1997.

8.       Cash and Cash Equivalents

As of December 31, 1998, the Company has cash and cash equivalents on deposit
with financial institutions and cash funds as follows:


                                                                                               
         Insured (FDIC)                                                                           $      60,000
         Uninsured:
           Repurchase agreements                                                                        283,000
           Collateralized by corporate debt securities held by the financial
              institution in the financial institution's name                                         1,232,000
           Collateralized by commercial paper held by the financial institution in the
              Company's name                                                                          1,487,000
         ECM cash funds                                                                                 164,000
         ECM-Thailand cash funds                                                                        162,000
                                                                                            -----------------------
                                                                                                     $3,388,000
                                                                                            =======================




                                       14


The carrying amounts disclosed in the table above represent the financial
institution balances as of December 31, 1998. The corresponding amount recorded
in the December 31, 1998, Consolidated Balance Sheet includes deposits in
transit and is net of outstanding checks.

9.       Business Affiliations

The Company is involved in negotiations for future business affiliations with
certain other foreign companies; however, no formal commitments for the
consummation of any such affiliations exist.

10.      Changes in Estimates

Revisions in contract profits are made in the year in which circumstances
requiring the revision become known. The effect of changes in estimates of
contract profits was to increase net income by approximately $210,000 in 1998
and $292,000 in 1997 from that which would have been reported had the revised
estimate been used as the basis of recognition of contract profits in the
preceding year.

11.      Pending Acquisition

On May 12, 1999, the Company signed a definitive agreement to be acquired by TSI
Incorporated ("TSI") of Shoreview, Minnesota. The closing of the acquisition is
scheduled to take place by the end of May 1999 and is subject to successful
completion of additional due diligence. Upon the closing of the acquisition, the
Company will operate as a wholly-owned subsidiary of TSI.



                                       15




Item 7(b) Pro Forma Financial Information


Pro Forma Condensed Combined Statement of Earnings
Twelve Months Ended March 31, 1999
(Unaudited)

The following unaudited pro forma condensed combined statements of earnings
represents the results of operations of TSI Incorporated and Subsidiaries as if
Environmental Systems Corporation (ESC) had been acquired April 1, 1998, on a
purchase accounting basis. This information should be read in conjunction with
the financial statements of the Registrant and ESC and the related notes
incorporated herein and incorporated by reference.

The accompanying unaudited pro forma financial information is based on the
Company's preliminary review and does not give effect to all adjustments
required to allocate the purchase price. The pro forma financial information is
not intended to reflect actual results of operations had the purchase of ESC
been effective on the date indicated, and is not intended to be indicative of
future results.

(All amounts in thousands)



                                                           Historical
                                                -----------------------------------
                                                         TSI         Environmental        Pro Forma            Pro Forma
                                                    Incorporated     Systems Corp.       Adjustments            Combined
                                                ----------------     -------------   -------------------       ----------
                                                                                                    
Net sales                                              $85,352          $23,942                                 $109,294
Cost of sales                                           37,158           13,131                                   50,289
Operating expenses                                      37,015            7,946                 636  (a)          45,597
                                                -----------------------------------  ------------------------------------
Operating Income                                        11,179            2,865                (636)              13,408

Other income (expenses)                                    435              128              (1,310) (b)            (747)
                                                -----------------------------------  ------------------------------------
Earnings before income taxes                            11,614            2,993              (1,946)              12,661
Provision for income taxes                               3,832            1,051                 705  (c)           4,178
                                                -----------------------------------  ------------------------------------
Net Earnings                                            $7,782           $1,942             $(1,241)              $8,483

Basic earnings per share                                 $0.69                                                     $0.75
Diluted earnings per share                               $0.68                                                     $0.74

Weighted average number of shares for
computation of basic earnings per share                 11,317                                                    11,317

Weighted average number of shares for
computation of dilutive earnings per share              11,482                                                    11,482





                                       16





Notes to Pro Forma Condensed Combined Statement of Earnings
(Dollars in thousands unless otherwise indicated)
(Unaudited)

The following describe the adjustments to the historical information of the
Registrant and ESC to give pro forma effect to the purchase of ESC.

     (a)      Reflects the following:

                                                                                          
                     (1)   Increased amortization of goodwill over 20 years
                             on a straight line basis                                         703
                     (2)   Increased amortization of other intangibles for
                              periods between 10 and 15 years, straight line                  133
                     (3)   Increased depreciation resulting from the step-up of
                              property, plant and equipment,  depreciated on a
                              straight line basis over 20 years                                50
                     (4)   Contractual reduction in salary expense                           (250)
                                                                                             -----
                           Total                                                             $636


     (b)      Reflects a decrease in the Registrant's interest income estimated
              at $350, and an increase in interest expense of approximately $960
              resulting from the debt incurred to finance the acquisition. The
              interest rate on the new debt of $15 million is assumed to be
              6.4%. A change of 1/8% percent in the interest rate would result
              in a change in interest expense and net income of $19 and $13
              before and after taxes, respectively.


     (c)      Adjusts the effective income tax rate of the combined entity to
              the Registrant's effective income tax Rate. Registrant expects its
              effective tax rate to be higher in the future because a
              significant portion of the purchase price (goodwill) will be
              nondeductible for tax purposes.




                                       17




Pro Forma Condensed Balance Sheet
March 31, 1999
(Unaudited)

 (All amounts in thousands)



                                                             Historical
                                               ----------------------------------------
                                                      TSI                  Environmental        Pro Forma       Pro Forma
                                                  Incorporated             Systems Corp.       Adjustments      Combined
                                               ------------------          -------------      -------------  --------------
                                                                                                         
Assets
Cash and cash equivalents                                 $13,437             $3,360          $(10,851) (a)          $5,946
Accounts Receivable, net                                   14,462              5,503                                 19,965
Prepaid expense                                               308                141                                    449
Inventories                                                15,539              1,175                                 16,714
Income taxes receivable                                         0                  0             2,210  (b)           2,210
Intangibles and other assets                                9,201              1,867            14,659  (c)          25,727
Property, plant and equipment, net                          8,021              4,823             1,000  (c)          13,844
                                               -------------------                                          ----------------
Total assets                                              $60,968                                                   $84,855
                                               ===================                                          ================

Liabilities and Stockholders' Equity
Accounts payable and accrued expenses                       5,338              6,461                                 11,799
Employee compensation                                       4,412                185                                  4,597
Taxes, other than income taxes                                473                                                       473
Income taxes payable                                        1,350                                                     1,350
Long term debt and other liabilities                            0              2,241            15,000  (d)          17,241
                                               -------------------                                          ----------------
Total Liabilities                                         $11,573                                                   $35,460
                                               -------------------                                          ----------------

Shareholders' Equity
Common shares                                               1,115                                                     1,115
Additional paid in capital                                 11,409                                                    11,409
Retained earnings                                          37,094                                                    37,094
Equity adjustment from translation                          (223)                                                     (223)
                                               -------------------                                          ----------------
Total shareholders' equity                                $49,395                                                   $49,395
                                               -------------------                                          ----------------
Total liabilities and shareholder's equity                $60,968                                                   $84,855
                                               ===================                                          ================




Notes to Pro Forma Balance Sheet
 (Dollars in thousands)
(Unaudited)

The accompanying unaudited pro forma financial information is based on the
Company's preliminary review and does not give effect to all adjustments
ultimately required to allocate the purchase price.


The following describe the adjustments to the historical information of the
Registrant and ESC to give pro forma effect to the purchase of ESC.

(a)         Reflects the following transactions:

                                                                                                              
                            Purchase price paid with existing cash                                               $(10,000)
                            Bonuses paid to employees and directors that exercised options, net





                                       18



                                                                                                              
                            of cash received from such exercise                                                      (851)
                                                                                                                     -----
                            Total                                                                                $(10,851)
                                                                                                                 ========


(b)         Reflects the estimated income tax refunds due from the exercise of
            ESC stock options prior to the acquisition.

(c)         To reflect the excess of acquisition cost over the estimated fair
            value of net assets acquired (goodwill). The purchase price,
            purchase price allocation, and financing of the transaction are
            summarized as follows:


                                                                                                              
                  Purchase paid as:
                            Cash                                                                                 $10,000
                            Proceeds from debt                                                                    15,000
                                                                                                                  ------
                            Total purchase consideration                                                         $25,000
                                                                                                                 =======
                  Allocated to:
                            Historical book value of ESC's assets and liabilities
                                 at March 31, 1999                                                     $7,982
                            Pro forma adjustment due to options exercised:
                                 Effect on cash                                                         (851)
                                 Income tax refund                                                     2,210
                                                                                                       -----
                            Total allocated to ESC historical  assets and liabilities                             $9,341
                            Step up of property, plant and equipment                                               1,000
                            Other intangible assets                                                                1,500
                            Deferred taxes                                                                          (900)
                            Goodwill                                                                              14,059
                                                                                                                  ------
                            Total allocation                                                                     $25,000
                                                                                                                 =======


(d)        Reflects the increased debt incurred to finance the acquisition.





Item 7(c)  Exhibits


                                       19