THE ROCKEFELLER INSTITUTE

A Graduate University and Research Center

NEW YORK, N.Y. 10021

April 15, 1965

PERSONAL AND CONFIDENTIAL

Professor Joshua Lederberg
Medical Center

Stanford University
Department of Genetics
Palo Alto, California

Dear Dr. Lederberg:

I am writing to acknowledge and thank you for your signature of the
Declaration presented to His Holiness the Pope. In the outcome we
received 81 signatures, 42 from Europe and Asia -- where resident
prizewinners were approached by Dr. P. B. Medawar of the National
Institute for Medical Research in England -- and 39 from North America,
Australia and Argentina.

Way l

This represents an almost united response -- particularly when it is
remembered that time did not allow us to approach every prizewinner,
and not all who would have liked to have signed were, in fact, able
to do so.

The Declaration was submitted to the Vatican through the Apostolic
Delegate in London, His Excellency Archbishop Cardinale. The letter
accompanying the Declaration emphasized that its purpose was only to
give the Pope first-hand evidence of the seriousness and sense of
concern with which learned men all over the world look upon the
consequences of an unregulated growth of population.

The whole matter has been kept private.
Sincerely yours ,
CO L|
E lL. Tatum

ELD :re
Enclosures