INDIANA UNIVERSITY BLOOMINGTON, INDIANA DEPARTMENT OF BACTERIOLOGY Mareh 8, 1949 Dr. de Lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Joshua: Iam enclosing a set of suggestions for autnors of sections in the manual of hetnods in Medical Researcnse Also, I enclose a few sample pages from the first volumes I would appreciate your letting me nave by the end of this month, if possible, an approximate estimate of the number of double spaced, type written pages that you tnink will be needed to cover the material on biochemical mutations and recombination in bacteria. I nope the sample of phage C26 arrived in geod condi- tion. The titer is probably between 107 ana 1019, With best regards, Ate ae 8S. E. Luria. vb