August 15, 1950.

Professor L. C. Dunn,
Department of Zoology,
Columbia University,
New York 27, N. Y.

Dear Doctor Dunn:

Enclosed herewith 4s an abstract of my forthcoming contribution
to "Genetics in the 20th Century". I regret that I do not have the
leisure and facilities here to prepare the written manuscript, and that
I shall have to defer working on 4t~ until I return to Madison after
the Jubilee meetings. I hope to have the manuscript ready not later
than the middle of October. However, I would appreciate learning of
your definite requirementa in this respect in order to change this date
in either direction as may be necessary or permissible.

Yours eincerely,

1
-

Joshua Lederberg,
Associate Professor of Genetics,
UNIVERSITY OF WISCONSIN.

P.S. Thank you for your note concerning the reference to bacterial
recombination in your textbook.

JL