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CO. few
July 26, 1976

Dr. Tan Chia-chen

Department of Biology

Futan University —

Shanghai, People's Republic of China

Dear Tan,

My friends John Lewis and Doug Murray tell me that they met you during
one of their visits about three years ago. I am sorry it has taken so
long for me to find that they had established this contact. with you.

I am just writing you now to discover the reality of this channel of
communication and to tell you how delighted I would be to find any
measure that might now be possible for the reestablishment of mutual
scientific and personal tength.

I am sure you have long since heard the sad news about Doby's death
just a few months ago which was a grief to us all. I am still in touch
with a number of our other mutual colleagues from Columbia and would
be happy to try to dig up any further news about them that you might
be interested in.

My own research here continues along rather molecular lines, but I
think some of that might nevertheless be of interest to you, and
especially as it may be coming closer and closer to the most important
practical applications in microbiology.

I realize that it has been 30 years, but I still have the most vivid
and warm recollections of our scientific discussions at that time.
and hope that it may be feasible to take them up again.

Sincerely yours,

Joshua Lederberg
Professor of Genetics

Prof. Jochug Lederberg
Bepartment of Genetics
School of Medicine
Stanford University
Stonford, Coliforsig 94305