STANFORD UNIVERSITY
STANFORD, CALIFORNIA

DEPARTMENT OF BIOLOGICAL SCIENCES

April 27, 1953

Dr. D. H. Wenrich
‘Department of Zoology
University of Pennsylvania
Philadelphia, Penna.

Bear Dr. Wenrich:

I am returning the manuscript by Lederberg and Tatum to
you herewith, along with your and Lederberg's covering letters,
with comments on the referee's suggestions.

As you will gather from these, we have modified the
manuscript, taking into account most of the referee's well-taken
points. However, we do not feel that "a judicious expansion" is
justified at this time.

You will notice a) that we would prefer reversing the
order of authorship as indicated on the title page, and b) that we
have made no. attempt to include and discusa papers which may have
appeared during the eight months since original submission of this
manuscript.

We hope our desicions in these matters meet with your
approval.

Sincerely,

E. L. Tatum

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Cc: Dr. J. S, Lederberg ‘

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