MERCK &CO,,INC. RAHWAY, N. J. MEDICAL DIVISION August 9, 1948 Dr. Joshua Lederberg The University of Wisconsin College of Agriculture Madison 6, Wisconsin Dear Doctor Lederberg: oe We were happy to send 1 Gm. of desoxypyridoxine on August 3, and we trust that you have received it by now. As you know we will be interested in hearing of its effect upon Salmonella bacteriophage. Cordially, Woy I Re C. Pogee, MeD. ROP :MMB