INST. FOR CELLFORSKNING OCH GENETIK MEDICINSKA NOBELINSTITUTET Stockholm, November 25, 1961. KAROLINSKA INSTITUTET STOCKHOLM 60 Telefon 23 5480 INST. FOR CELL RESEARCH AND GENETICS KAROLINSKA INSTITUTET STOCKHOLM 60 Professor Joshua Lederberg Stanford University Medical Center Department of Genetics Palo Alto, California, USA Dear Joshua: Many thanks indeed for the book, which I have enjoyed very much, mainly in the nights in the bed - thatis ima place where one does not write letters of thanks. The working plans, we have together with the Boston group you know of, have suddenly got widenend very intensely as a result of my visit to Boston after the October-meeting in New York, In fact I am just going back to Boston tomorrow for a continuation of these dis- cussions and there has been little intelligent work done in the laboratory by me these last weeks which is the reason I have not let hear from me before. However, in early December I will be back again and start a more stable existence. With kindest regards from house to house, I am, Very TC:dn