BUREAU OF LABORATORIES FRIEND LEE MICKLE So. D. DIRECTOR LABORATORIES PO. BOX 2340 LlToa MAIN ST. TELEPHONE 7T-6341 COMMISSIONER OF HEALTH STANLEY H. OSBORN.M. D., C. P. H. STATE OF CONNECTICUT DEPARTMENT OF HEALTH HARTFORD,1 bs? Joshua Lederberg, Ph.D. Department of Genetics College of Agriculture University of Wisconsin Madison 6, Wisconsin. Dear Lederberg: Thank you for your kind letter of Jamary 9 referring to my speculations on transduction in Salmonella. I shall be mich inter- ested in following your further studies. Unfortunately, I do not have any cultures at the moment which might be of interest to you beyond those which Dr, Edwards has already placed at your disposal. With kindest regards Sincerely yours, pte [Bre BKB/MPA Assistant Director Form O-L 1 (11-51)