Scottish bacteriologist (1881–1955) who shared the 1945 Nobel Prize in Medicine for his role in the discovery and isolation of penicillin. ALS, one page, 8.5 x 11, British Army Staff, Washington D.C. letterhead, July 13, 1945. Fleming writes to Mr. Mercer. In full: “In reply to your letter of July 6th, which I only got this morning on my return to Washington, I shall be pleased to do the broadcast interview. I leave this afternoon and will not be back here until July 23rd. I should be very glad if you could prepare a draft script and then we could discuss it when I return. The broadcast would have to be between July 23rd & July 26th but not on the evening of July 25th….” In very good condition, with intersecting folds, wrinkling, and mild toning. R&R COA.