<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BIOANALYTICAL SYSTEMS, INC. CONSOLIDATED FINANCIAL STATEMENTS CONTAINED IN THE COMPANY'S QUARTERLY REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> SEP-30-1998 <PERIOD-START> OCT-01-1997 <PERIOD-END> DEC-31-1997 <CASH> 3,667 <SECURITIES> 0 <RECEIVABLES> 2,759 <ALLOWANCES> 0 <INVENTORY> 1,931 <CURRENT-ASSETS> 8,629 <PP&E> 13,689 <DEPRECIATION> 2,960 <TOTAL-ASSETS> 20,166 <CURRENT-LIABILITIES> 2,237 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 972 <OTHER-SE> 15,574 <TOTAL-LIABILITY-AND-EQUITY> 20,166 <SALES> 2,642 <TOTAL-REVENUES> 4,330 <CGS> 949 <TOTAL-COSTS> 1,847 <OTHER-EXPENSES> 2,159 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 22 <INCOME-PRETAX> 348 <INCOME-TAX> 152 <INCOME-CONTINUING> 196 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 196 <EPS-PRIMARY> .06 <EPS-DILUTED> .05