MERCK & CO., INC.

RAHWAY, NEW JERSEY

RESEARCH & DEVELOPMENT DIVISION

November £3, 1951

Via AIR MAIL

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

Dear Doctor Lederberg:

Dre Karl Folkers and I expect to be in Madison
on Tuesday, December 11. We would like very much to
visit you during the afternoon of that day if convenient
for yous

We have been employing your technique for ob-
taining mutant cultures using penicillin as a selective
agent and are very much interested in other phases of
your studies which have been described in the literature.
I was present at the symposium at Cold Springs Harbor
when you originally described your studies with Dr. Tatum
on gene recombination in microorganisms and have been
most interested in the subsequent developments.

Dre Folkers has been most interested in your
studies on microbial genetics and the leads which they
have given towards understanding the bicchemical processes
in microorganisms.

I hope that the indicated time will be satisfac-
tory for our visit. If not, we could probably arrange a
meeting on Wednesday, December 12. Please let me know
whether the proposed visit is satisfactory with you.

Sincerely yours,

o / r “
MB Wgebud /
He Be Woodruff
Assistant Director

HBW:EJS Microbiological Research