April 18, 1955

Dr. T. Caspersson

Institute for Cell Research and Genetics
Karolinska Institutet

Stockholm 60

Dear Dr. Caspersson:
I have just received your airmail of the lst April.

While I have been most favorably impressed with the quality
of Up, Klein's publications, I have not yet met him, and would be
hesigant to offer an opinion on such a weighty decision.

However, I am looking forward to meeting Dr. Klein soon, and
to attending the discussion on ascites tumors at the forthcoming
session of the New York Academy of Sciences. Since I will then be
in so mich better a position to comment, may I ask to defer this
until about one month from now?

With best personal respects,

ours sineérely,
f Atm ted) i. [. ve

[ Joshua Lederberg
/ Professor of Genetics

/
i