April 28, 195)

Dr, Robert Paul. Levine
Biology Laboratories
Harvard University
Cambridge 38
Massachusetts

Dear Pauls

When I came home from the Oak Ridge meetings, I recalled your
remonstrance about having failed to answer your letter of March, 153.
I have gotten this out again and can now understand why I let it slide,
though an apology is perhaps still in order, I really would not be
qualified to make any informed comment on the question of inter-
chromosome effects on crossing-over, though I follow this subject as
an interested outsider. I had heard Schultz give the paper at the 1951
symposium, but my recollection of it could not have been fugzier, Pere
hapa, as Esther says, this is because I was not there most of the time,

Concerning the reprint of my review on hereditary symbiosis, I
am sorry that the extremely limited supply that I was able to purchase
prevented me from distributing reprints as freely as I would have liked,
This situation unfortunctely still prevails, but I understand that copies
can be purchased from the Physiological Reviews at the cost of 50 cents,
if you are still interested, 4 couple of weeks ago, I did send you a
bateh of more recent papers, and will be pleased to continue to exchange
with you.

Good Inck to you at Harvard,

Sincerely,

Joshua Lederberg