Columbia University
intheCitpefHewPork 27

LABORATORY OF BIOPHYSICS

November 29, 1946

Mr. Joshue Lederberg

Osborn Botsnical Laboratory
Ysle University

New Haven, Connecticut

Dear Lederberg:

Thank you for your kindness in
sending several reprints recently. The
idea about cancer being a reverse mu-
tant is certainly a sensible one, and
I hepe it leads to some good experi-
mentation.

Yours sincerely,

a

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CG
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Selig Hecht