COMITATO ORDINATORE PER IL IX CONGRESSO INTERNAZIONALE DI GENETICA Segreteria Generale: Istituto di Genetica dell' Universita Via Celoria 10 - Milano ({ltalia) Milan, October 20th, 1952 To Prof. J. Lederberg Dept. of Genetics - University of Wisconsin Madison Dear Sir, The Scientific Programme of the IX International Congress of Genetics is now under consideration. The Organizing Comnittee , on whose behalf I am writing, intends to have a number of critical Reviews on most recent developments in Genetics. We should like to take advantage of your participation in the Consress and thereby 1 am extending to you an invitation to give a paper. We need of course to know the subject and tentative title of your lecture as we will have to fit it into the detailed Programme. Time allowed for such invited papers will be 30 to 40 minutes. I shall appreciate receiving an answer at your earliest convenience , and, in any case, not later then November 20th. Sincerely yours / ‘ C. Barigozzi - Secretary