Lonc IsLAND BIOLOGICAL ASSOCIATION
COLD SPRING HARBOR, LONG ISLAND

THE BIOLOGICAL LABORATORY October 9, 1950

Dr. Joshua Lederberg

Dept. of Genetics

College of Agriculture we
University of Wisconsin

Madison, Wisconsin

Dear Josh:

Both for my benefit and that of students taking the bacterial
genetics course next summer, I would like to obtain a more complete
set of your reprints. We do not need:

Heredity 1948 2: 145-198

Cold Spring Harbor Symp. 1946 XI 113-114

Am. Rev. Mic rob. 1949 1—22

Proc. Nat. Acad. Sc. 1949 35: 178-184

Genetics 1947 32: 505-525

We have also been interested in bacterial resistance to enzyme

inhibitors and would like to produce crosses of resistant and non
resistant stocks, using strains having suitable genetic markers,

somewhat as described by Cavalli and Maccacaro in the current MGB.
Could you send me two K-12 strains well tagged and not too ornery?

Yours sincerely,

Verein Eraser

Vernon Bryson

VB:ef