Columbia University in the City of New York New York 27, N.Y. / DEPARTMENT OF ZOOLOGY September 21, 1961 Dr. Joshua Lederberg Department of Genetics Stanford University Palo Alto, California Dear Josh, when Betty and I would be delighted to see yougcome to New York and reiterate our invitation for you to stay with us. We will make our guest room available the nights of Wednesday, October 4, and Thursday, October 5. I know you will be busy at the Academy meetings but I'm sure we will find occasion to talk about the many things there are to say. With all best wishes to Ester and yourself. Professor of Zoology A FIJR/cg