MERCK & CO.,INC.

RAHWAY, N. J.

RESEARCH LABORATORY April 350, 1947

Dre Joshua Lederberg

Osborn Botanical Laboratory
Yale University

New Haven, Connecticut

Dear Dr. Lederberg:

In response to your request of April 21,
we are sending to you, uncer separate cover,
2 x 127,000 of streptothricin hydrochloride
(4R3256). It is our understanding that you plan
to use the material for a continuation of your
genetic research.

Sincerely yours,

6. Woe

J.{C. Woodruff
Director, Microbiological Research

JCW/ jef