NATIONAL ACADEMY OF SCIENCES

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OFFICE OF THE HOME SECRETARY
2101 CONSTITUTION AVENUE
WASHINGTON 25, D.C.

April 23, 1957

SIR:

I have the honor to inform you that you were elected a member
of the National Academy of Sciences at its Annual Meeting held in
Washington, April 22 to 24, 1957. The Academy thus desires to ex-
press its high appreciation of your services to science, and hopes
you will signify your acceptance of this election.

In due course a diploma signed by the officers of the Academy
will be sent to you. In your letter of acceptance will you please
indicate the exact form in which you wish to have your name appear
on the diploma.

Assuring you of my personal pleasure in counting you as one of
our members, I am :

Respectfully yours,

Hugh L. Dryden
Home Secretary

Dr. Joshua Lederberg
University of Wisconsin
Madison 6, Wisconsin