UNITED STATES

ATOMIC ENERGY COMMISSION
WASHINGTON 25, D. Cc.

August 31, 1951

ir. J. Lederberg
University of Wisconsin
Madison 6, Wisconsin

Dear Dr. Lederberg:

We are sending you a copy of the Atomic Mergy Com-
mission's Tenth Semiannual Report to Congress, I think you
will be interested in the data contained in this report with
respect to the recent biology and medicine activities and
the progress of our major programs. This report contains
preliminary data on the weapons tests recently carried out
in January and February at the Nevada Test Site and in April
and May at the Eniwetok Proving Grounds,

We feel, because of your direct participation in the
Atomic Energy Commission program, that you will have more
than an ordinary interest in this report.

Sincerely yours,

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Shields Warren, M.D
Director
Division of Biology and Medicine