LABORATORY SERVICE

UNIVERSITY OF MINNESOTA

University or Minnesota Hosprrars

Minneapouis 14

March 11, 1952

Dr. J. Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin
Dear Doctor Lederberg:
Possibly I waited toblong before trying to culture the E. Coli
B strain which I obtained from you about November 1. When 1 did
open it and the "phage" a short time ago, no growth occured. If

you can send another, I would appreciate receiving mother culture

of HE. Coli B and a Te bacteriophage.

Sincerely yours,

Newell R. Ziegler
Assoc. Prof. of Bact.
and Immunology

NRZith