April 16, 4975

Professor U.S. von Euler

Chairman of the Board of Directors
Nobelstiftelsen

The Nobel Foundation

Sturegatan 14

S-114 36 Stockholm SWEDEN

Dear Professor von Euler,

I thank you for your letter of 7 April concerning the Nobel
Foundation's plans for a 75th anniversary celebration this December.

You ask for an early preliminary reply.

I regret that according to preliminary indications I will not be able

to attend; but I am sure this will not be missed in what will be a brilliant
occasion.

With warmest personal regards,

Joshua Lederberg
Professor of Genetics

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JL/rr