December 4, 1951
Dear Esther:
Thanks a lot for the nice picture.  It will survive as a good souvenir of those delightful days spent last year in Madison.
Glad that your work is proceeding well.  Covering mine, I had a paper in the last issue of the [...] Institut Pasteur, on lysa induced by X-rays in lysogenic bacteria.  Another one will appear in the January issue of the J. Gen. Physiol. on Restoration of irradiated microrganisms by catalase.  This work seems to reveal a mysterious link between restorability by catalase and lysogenicity: K-12 (lysogenic) is powerfully restored; B/[?] very very little, and B not at all.  Lysogenic Megatherium 899 is powerfully restored;
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non lysogenic Mega Mox, derived from the former, is very little.
The irradiated system K-12 single infected with T2 is restored (as regards T2 growth); the irradiated system B-T2 is not. etc.  I'll send you the reprints when available.  Please send me your's (including Josue's).
Best regards to you both, and thanks again
Sincerely
Raymond L.