THE UNIVERSITY OF TEXAS
AUSTIN 12

DEPARTMENT OF BACTERIOLOGY 14 January 1952

Dr. J, Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Dr. Lederberg:

I am interested in obtaining several Escherichia coli mutants,
Those I wish to obtain include thiaminless, cystineless, and purineless

organisms, A sgatkigiess organism would be preferred among the purineless
mutants, Zenthin fess

If you happen to have any of the above mentioned mutants in your
possession I would deeply appreciate your sending them to me, These
organisms would be extremely valuable in connection with = me of my
work here,

Sincerely,

jet pw. fer,

ackson W, Foster