CZECHOSLOVAK ACADEMY OF SCIENCES
BIOLOGICAL INSTITUTE
NA CVICISTI 2 - PRAHA 6

Czechoslovakia

Dr. Joshua Lederberg,
Department of Genetics
Stanford University

School of Medicine

Palo Alt o,California

Merch 18, 1961

Dear Doctor Lederberg 3:

Thank you very much for the answer to our letter anc for
the suggestion concerning Dr. Nossal to whom the invitation
has been also extended. Since we would like rather the theore-
tical aspects of the problems of immunological tolerance to be
discussed, I need not tell you that your personal participation
would mean an excellent contribution to the program of the con-
ference. I do hope very much indeed that it will be possible
for you to include the conference into your plans for this
autumn.

Looking forward to the pleasure of seeing you in Czecho-
slovakia next November, I am

with best regards,
Yours sincerely,

Milen Hasek