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Columbia Aniversity
College of Physicians and Surgeons

630 WEST 168TH STREET
NEW YORK 32, N. Y.

DEPARTMENT OF BIOCHEMISTRY

April 4, 1946.

Dr. Joshua Lederberg

Yale University

Osborn Botanical Laboratory
New Haven, Connecticut
Dear Dr. Lederberg:

I am having difficulties obtaining the tritium
water. Although Dunning has it,it is actually the property
of the Army. Before distributing it he must receive Army
approval. This is a rather difficult thing to get. I will

let you Know as soon as I can obtain a sample.

Very truly yours,
_o . st wan

LAA Cte
D. Rittenberg 7
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