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INREPLYREFERTO DI,(RCM: jt)

Dr. Joshua Lederberg ey 19 16
Department of Genetics 0

Stanford University

Palo Alto, California

Dear Dr. Lederberg:

It is my pleasure to invite you and your colleague,
Dr. Soffen, to become tentative experimenters on the payload
proposed for the 1964 Mariner B mission to Mars. The final
payload, designated P70, will be determined as soon as
definitive spacecraft information concerning weight, power,
volume, telemetry, etc., has become available. In the mean-
time, we plan to proceed with the development of the
instrumentation required for the abbreviated microscope
system experiment for the capsule to determine whether it
will be capable of meeting the proposed specifications and
of being integrated into the payload.

Please contact Dr. G. Neugebauer of the Jet Propulsion
Laboratory if you have questions concerning instrument
development. Should you require research funds to support
the experiment and do not have an existing contract with
NASA from which such funds might be made available, please
present your budgetary requirements, either individually or
as a group, to NASA Headquarters for consideration,

A meeting will be held shortly to brief all experi-
menters on their role, the payload and its mission, and
other pertinent information. You will be notified when the
date and location have been determined.

Sincerely,

Abe Silverstein
Direcgor of Space Flight Programs