DEPARTMENT OF BIOLOGY SPENCER HALL

MORGAN STATE COLLEGE

BALTIMORE -12, MD.

September 28, 1953

Dr. Joshua Lederberg,
Department of Genetics,
Univ. of Wisconsin,
Madison, Wisconsin.

Dear sir:

Would you be so kind as to send me a culture
of the following organisms. I am interested in try-
ing some genetic studies, about which I shall write

you: later,

E, coli, strain K-12
E. coli, strain B
fo E. coli, strain B/r

Thanking you in advance, I am

Yours truly,

hake KE Werrreg

Clarence L,&, Monroe
Dept. of Biology,
Morgan State College,
Baltimore, 12 Md,