THE WISTAR INSTITUTE

THIRTY-SIXTH STREET AT SPRUCE
PHILADELPHIA 4, PA.

HILARY KOPROWSKI, M.D. PHONE: BARING 2-6700

DIRECTOR CABLE ADDRESS: WISTARINST

April 2, 1963

Dr. Joshua Lederberg
716 Alvarado Row
Stanford, California

Dear Josh:

In spite of all efforts, I am unable to find someone to
substitute for me for my Virology Lecture on Monday, April 29th. I

was wondering, therefore, if it would be possible to push up my trip
to the week of April 22nd,

Specifically, I could fly out to San Francisco on the
newly scheduled non-stop jet Wednesday evening, April 24th. We
could then spend Thursday and Friday on business discussions and
perhaps devote Saturday to relaxation. I would then return home
early Sunday morning. ¢

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I don't know if this new schedule will fit in with your
plans but I do hope thet eventually, we will hit on 1 something that will
suit us both and that we can get together.

All the best to you and Esther,

Sincerely,

Hilary Koprowski, M.D.
Director

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