July 8, 1949.

Dr. EF. P. Wigner,
Palmer Physical Laboratory,
Princeton University, —

New Jersey.
Dear Dr. Wigner:

I recall very well our meeting last year, but as I remember the uain
topic of cur conversation concerned the taxonomic problems ef defining bacteria.
I remember also that we discussed aging, but I believe that I had not pre-
Vicusly heard of the article to which you refer, unless perhaps Szilard had
mentioned it. I regret that I an still unable te indicate where this reference
may be found. However, may I make two suggestions which might put you on the
right track. Firstly, you have in Dr. K. C. Cooper, in the Dept. of Biology,
@ man on your own campus whos prebably is better infcrmed on such subjects
than I am, and who would, I am sure be glad to discuss the problem with you.
Secondly, the only worker in St. Louis of whose interest in aging I am aware
is F. V. Cowdry, who edited a compilation sone years ago ontitled "Problems of
Aging". This book can probably be found in most medical or biology Libraries
and may contain information relevant to your problem. Since, I believe, Szilard
or Novicic had also mentioned the matter, they might be in a favorable position
to give you a better reference. Dr. Robert Boche, at the Institute of Radioblolegy
also, is working muayingx on afing effects of radiations, and can probably be
very helpful too.
tf am sorry that I cannot be of more direct assistance.

Yours sincerely,

Joshua Lederberg