THE UNIVERSITY OF CHICAGO
CHICAGO 37° ILLINOIS

INSTITUTE OF RADIOBIOLOGY AND BIOPHYSICS

5650 Ellis Avenue

August 2h, 1951

Dr. Joshua Lederberg
Department of Genetics
College of Agriculture

The University of Wisconsin
Madison 6, Wisconsin

Dear Josh,

Jane and I had hoped to visit you during
our vacation, which is the three weeks beginning
Monday. Meanwhile, we have been offered a ride to
New York City, and so will have to postpone our
visit,

McElroy's data stunned me. His organisms
must be sexatropic to be able to find lovers ata
density of 10°,

Next week we will be staying at Jane's
mother's apartment. The address is c/o Leona Chalkley,

#326 North Lake Shore Drive, Chicago, Illinois.
1360

Regards to Esther,
Sincerely,

Aaron Novick

AN/sds