oe CABLE ADDRESS ‘‘ RESEARCH" IN YOUR REPLY PLEASE QUOTE FELE NO. sscecsssseceeenscceersenverartenreceees NATIONAL RESEARCH COUNCIL CANADA ATOMIC ENERGY PROJECT CHALK RIVER. ONT. 10 October, 1951 Dre Je Lederberg, University of Wisconsin, Department of Genetics, College of Agriculture, Madison, Wisconsin. Dear Joshua: Many tnanks for your note, and for the sugges= tions concerning the mutation experiment. Do not hesitate to have one of your people work on this. It should be done, but I am pretty much involved in otner things at the moment. Klaus Rothfeis is now back at the Department of Botany, University of Toronto, Toronto, Onte He told me that his discussion for tne C.S.He volume haa been sent in, but it would not hurt to contact him directly. His manuscript, incidentally, has gone to "Genetics". Sincerely, poe, HBN/ir He Be Newcombe