April 7, 1964

Professor M, Florkin
Laboratoire de Biochimia
Universite de Liege

17 place Delcour

Liege, Belgium

Dear Professor FPlorkin:

Our earlier correspondence has perhaps crossed in the matl. In any
case I thought I showld write you again that unfortunately sefther
Dr. Levinthal nor I will be able to leave Stanford this spring and
therefore will not be able to attend COSPAR at Florence,

COSPAR deserves every encouragement to pursue the earth's comaon
interest in planetary hygiene, which remains too Luportant to be

left to competitive happenstance or to uncertain praconeeptions

about the planetary habitats, However, I should say that personally

I could now add little to what has already been published and reviewed
in Professor Heden's very useful compendium. It clearly is time to
elicit a auch wider front of scientifically formed opinion as the base
of international policy in this area.

Sincerely yours,

Joshua Lederberg
Professor of Genetics

ce: Professor Heden
Enc: Stanford Today, Winter 1663

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