SOUTHERN ILLINOIS UNIVERSITY

CARBONDALE. ILLINOIS

November 9, 1955

Dr. Joshua Lederberg
Department of Genetics
University of Wisconsin
College of Agriculture
Madison 6, Wisconsin

Dear Josh

   I want to thank you for your references to cases of
preferential segregation.  I have studied them very
carefully and find them very pertinent, and I am planning
to include them in our paper.

Thanking you again for your kindness, I am

Sincerely yours,
w

          L-
Carl C. Lindegren, Director
Biological Research Laboratory

CCL:gb