Deceaber 31, 1953

br. Warrea Weaver

Director for Natural Sciences
The Rockefeller Faunda tion
49 West 49 Street —

Wew York 20, N.Y.

Dear Dr. Weaver:

I am happy to submit at this time a final report of our activities
that were supported by a research grant from the Foundation during 1952
and 1953. I hope the delay has occasioned no inconvenience.

At Mr. Cobb's request I am also enclosing a photograph of a corner
of our laboratory for possible use in the Foundation's Annual Report.
Figure 1 of ay own final report is available for the sams purpose. As
this material has not yet been published owing to my stated reservations
as to ite evidentiary validity, I must ask that this figure not be made
available for publication elsewhere than in the Foundation's own report,
or in any place where the qualifying caption aight be discarded.

With best wishes for the new year,

Yours sincerely,

Joshua Lederberg