Oct. 25th, 1948
Dear Dr. Lederberg,
I have been very interested in your work on the Genetics of Microorganisms and should be glad to receive separates of your publications if you can spare them.
My own work has not included microorganisms but it seems to me that the technique of experiment on the mutation of the incompatibility gene in higher plants is similar to that used in bacterial genetics.
I have recently been looking
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through the literature for "examples of mutations involving a qualitative change in gene function".  To quote your own words and I was quite pleased to see the conclusions you were led in your recent review.
Yours sincerely,
D Lewis