BOARD OF TRUSTEES EXECUTIVE COMMITTEE

Representing the following organizations: AMERICAN TYPE CULTURE COLLECTION KENNETH B. RAPER, CHAIRMAN
2029 M STREET, N. W. R. E. BUCHANAN
SOCIETY OF AMERICAN BACTERIOLOGISTS H. H. MCKINNEY
WASHINGTON 6, D. C.
AMERICAN PHYTOPATHOLOGICAL SOCIETY CURATOR

AMERICAN ASSOGIATION OF FREEMAN A. WEISS

PATHOLOGISTS AND BACTERIOLOGISTS ASSISTANT CURATOR

AMERICAN SOCIETY OF ZOOLOGISTS WILLIAM ARTHUR CLARK
MYCOLOGICAL SOCIETY OF AMERICA ISABELLA S. BOULDIN, BACTERIOLOGIST
AMERICAN INSTITUTE OF BIOLOGICAL SCIENCES HUANG, SHUH-WEI, Mycoxocist

NATIONAL RESEARCH COUNCIL SECRETARY-MANAGER
KATHERINE ALVORD

November 16, 1955

Dre Je Lederberg

Department of Genetics

The University of Wisconsin
Madison 6, Wisconsin

Dear Doctor Lederberg:

De you have a culture of Escherichia coli strain K-125 (the indicator strain
for bacteriophage lambda) that you would be willing to deposit in our Collection?
The A. Te. Ce Ce is collecting bacteriophage systems, We already uave the lysogenic
Kel2 strain of E. coli; however, we would like to add to our Collection the
indicator strain for phage lambda if you have one which you would send us.

Sincerely yours,

William ¢érthur Clark
Assistant Curator