EXHIBIT 15 LETTER RE: UNAUDITED INTERIM FINANCIAL INFORMATION The Midland Company: We have made a review, in accordance with standards established by the American Institute of Certified Public Accountants, of the unaudited interim financial information of The Midland Company and subsidiaries for the periods ended September 30, 1999 and 1998, as indicated in our report dated October 14, 1999; because we did not perform an audit, we expressed no opinion on that information. We are aware that our report referred to above, which is included in your Quarterly Report on Form 10-Q for the quarter ended September 30, 1999, is incorporated by reference in Registration Statements No. 33-64821 on Form S-3 and No. 33-48511 on Form S-8. We are also aware that the aforementioned report, pursuant to Rule 436(c) under the Securities Act of 1933, is not considered a part of the Registration Statement prepared or certified by an accountant or a report prepared or certified by an accountant within the meaning of Sections 7 and 11 of that Act. /s/Deloitte & Touche LLP Deloitte & Touche LLP Cincinnati, Ohio October 14, 1999