UNIVERSITY of PENNSYLVANIA PHILADELPHIA 4 The College ZooLocicaL LaBoRATORY 38th St. and Woodland Ave. May 28, 1952 Dr. Joshua Lederberg Department of Genetics College of Agriculture The University of Wisconsin Madison 6, Wisconsin Dear Dr. Lederberg: Thank you for your letter of May 26th. With regard to the questions you raise, I may say that my feeling is that we ought to make this Volume as self- contained as possible. In harmony with that idea I would recommend illustrations of your cytological preparations, as well as a discussion of cytological results reported by others; and I should favor including a reasonable coverage of the nethoaƩt our work. I have not had estimates from enough of the contributors to the Volume to get a satisfactory idea of its probable size, but I doubt if it will ZO over 250 pages; and it may be smaller than that. I should hope that it could be put on the market for somewhere around $4.00, but of course I cannot anti- cipate the final result of the publication effort. Very sincerely yours, D. H. Wenrich DHWs:se