HARVARD UNIVERSITY
THE BIOLOGICAL LABORATORIES
16 DIVINITY AVENUE
CAMBRIDGE 38, MASSACHUSETTS

September 16, 1954

Dr. Joshua Lederberg
University of Wisconsin
Madison, Wisconsin

Dear Josh:

Many thanks for the references. I will
look them up as soon as I get a chance.

The "%nsect 6hlorophyll" looks particularly
interesting. Do you expect to do something
about it? Another reference on it is by
Okay, S. — Rev. Fac. Sei. Univ. Istanbul
Ser. B. 12, pp. 89-105.

With all regards.

Sincerely,

George\ Wald
aw/ef