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DEPARTMENT OF BACTERIOLOGY AND IMMUNOLOGY
HARVARD MEDICAL SCHOOL
23 SHATTUCK STREET
BOSTON 15, MASGACHUSETTS

November 20, 1958

Dear Josh and Esther:

It was nice to see you again
andoto have a chance to talk to you. I was afraid
that with all the rush we wouldn't have a chance to
say more than hello.

I forgot to mention the reprint problem.

Did you order any reprints to distribute yourself? I

mean reprints of my last paper. If you did, I would

like to know your mailing list so as not to duplicate
it.

With regard to the strains: The problem is
to see if there is a mutant with" galactoside-permeasd"
and without"thiogalactoside-permeasd!! I have the
following strains: 1317, 22h, 22h2, 2107. I would
like to test the following:

K12 wild (I have a strain from Magasanic)

We2h) negative-cr¢ptic (lac,7)

K12S), normal constitutive (looks like Monod's
equivalent of W1317)

W13011 constitutive cryptic

W22h7 Lae?” hav

Please include any other strain you think it
would be worthwhile testing.

I will be here, at Harvard, until the end of
Novembery afterward you can reach me at Veterans
Administration Hospital, Radioisotope Servire, Albany,
NeYe

Best regards,
yours,