November 22, 1972 Dear Dr. Lederberg: Your letter to Dr. Gabriele Ehrlich of October 13, 1972 was forwarded to me. I am sorry to inform you that Dr. Ehrlich died two years ago in Vienna. I have shown your letter to Dr. Zacharias Dische, who worked in this department for all the years Dr. Ehrlich did, but even that he knew Dr. Ephrussi and Dr. Ehrlich well he did not remember anything which could contribute to your inquiry. Yours sincerely, Dr. W. Manski Associate Professor of Microbiology Assigned to Ophthalmology