YALE UNIVERSITY

DEPARTMENT OF MICROBIOLOGY 310 CEDAR STREET
NEW HAVEN 11, CONNECTICUT

January 16, 1953

Doctor Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Doctor Lederberg:

Thank you so much for the reprints which you so
graciously semt me. Of course I have been following your work
both from your publications and from your reports to the United
States Public Health Service. It is a real pleasure to read
them and it will be most useful for me to have them at hand
so that I can easily consult them.

I was a little confused concerning the question
you asked me about fowl pox virus. For the time being I adopted
the conservative attitude of considering fowl pox virus latent
in chickens, as I would consider any infectious agent like a
bacterium under the same conditions. I could, of course, go
on commenting on that fundamental point almost indefinitely.
Let's hope that we will be able to have a constructive discussion
on that subject if we zet together some time,

Under separate cover I am sending you reprints
of papers recently issued from my laboratory. I would appreciate
it if you would send me any of your future publications.

Sincerely yours,
F, Duran-Reynals, M.D.

P.S. I am wondering whether you have seen the paper by Klein,
Cancer Research, Vol. 12, 1952, p. 589. He is apparently
proving that the results obtained by Stasney, et al,
are due to the persistence of cells in the fractions
injected.

FDR/j