YALE UNIVERSITY OSBORN BOTANICAL LABORATORY NEW HAVEN, CONNECTICUT October 22, 1948 Dr. Joshua Lederberg Department of Genetics College of Agriculture University of Wisconsin Madison 6, Wisconsin Dear Josh: There must have been some slip-up if you didn't get the lecture and seminar schedule of the Genetics of Microorganisms Course. I am enclosing one for you. Regarding the number of lectures, you're slated for two class lectures to be held Tuesday and Thursday afternoon at 4:30. You're also slated for one gemeral seminar on Wednesday evening at 8:00. It turns out actually, that the audience of the seminar is nearly identical with the audience in the class. There are usually about 30 persons. Regarding lectures on overlapping subjects, the only person who may overlap is Ryan, who is talking here next Tuesday and he will probably be more concemed with bacterial reversion, McCarty is also to give two lectures next week and will deal etire- ly with the problem of bacterial transformations. Your three lectures can be on any subject that you would like. Regarding the manuscript, manuscripts are not demanded, You get your hundred bucks anyhow. As a mtter of fact, the lectures are being recorded by a Soundscriber instrument so that the depart- ment has a permanent record of your lecture without your having to write a manuscript, We will have some lactose ame EMB agar ready for you. Our phone number is New Haven 3-44.20 and we are listed in the directory. If you get here late Monday night, call us since the chances of your met finding our place are quite poor. Best regards, Sincerely, 4 yee David M. Bonner Associate Professor of Microbiology