YALE UNIVERSITY OSBORN BOTANICAL LABORATORY NEW HAVEN, CONNECTICUT January 6, 1950 Dr. Joshua Lederberg Department of Genetics University of Wisconsin Madison, Wisconsin Dear Josh: I am enclosing the material we discussed, in part, ie, I find I have only one copy of my paper and am sending you the section dealing with gene action. I am also enclosing a copy of a similar section of Horowitz's paper that is to appear this spring in one of the Annual Reviews. I asked Dr. Sinnott about a lead article in Science and he feels sure that it will be possible. At his suggestion I am writing Bently Glass who, as you know, is the genetics editor for Science, Next week I hope to draw up an outline of what I would like to propose for this paper and will send this along for your comments. As ever, oo / f David M, Bonner Associate Professor of Microbiology Zz Knelosures (2)