WESTERN RESERVE UNIVERSITY
CLUEVELAND 6, OHIO

SCHOOL OF MEDICINE

DEPART

Carpe

MENT OF MICROBIOLOGY September 16, 1952

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

Dear Dr, Lederberg:

In keeping our departmental stock culture collection, we have, in
general, lyophilyzed our cultures and gone through all the attendant
fuss and bother. JI understand that you have been preserving most of
your cultures and, particularly, the various mutants and segregants
that you have on silicalgel. I should imagine that this is a much
simpler procedure where a,plicable and I wonder if you would be willing
to give us details on the method as you use it, Also we'd appreciate
any information you have as to the types of organisms with which this
method has been used.

With best regards,

Sincerely yours,

(I. 0. Lampen em

JOL: jm