INST. FOR TUMORBIOLOGI KAROLINSKA INSTITUTET STOCKHOLM 60 DEPT. OF TUMOR BIOLOGY KAROLINSKA INSTITUTET STOCKHOLM 60 Stockholm, January 19, 1960 Professor Joshua Lederberg Department of Genetics Stanford University Palo Alto California USA Dear Joshua: Thank you very much for the letters of invitation which will be very helpful and also for your beautiful card from Nice. It was almost incredible to imagine the snow on those beaches. Unfortunately, I have not known of the symposium in London in April before, and it is too late to srrange anything now. If you would have any chance to come this way,we would be most happy to have you and T am sure that we could arrange for your travel and living expenses between London and Stockholm. You may be interested to hear that we have finally solved the problem of a visiting professor; after much correspondence Bertani has accepted to come September 1, 1960. His wife will be with him, and they will both stay here a year. With warm greetings, oto Ap beth. / Yours as ever, “~ / 7 1K» fA George Klein GK/APT