4/5/47
Dear Josh,
Sorry I couldn't see you this past weekend. Two lectures and the arrival of Wiken really kept my hands full.
Your mutant sounds extremely interesting -- a little amazing. I'll be glad to hear more about it.
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I think we have the histidineless population story cracked. The histidineless mutant on low histidine uses up the medium in a very inefficient fashion -- probably PO4 equals
If Spring really comes we shall be to Yale shortly.
Regards
Francis.