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Columbia Gniversitp
inthe Citpof Hew Pork
[NEW YORK 27. N. Y.]

DEPARTMENT OF ZOOLOGY

October 13, 1955

Dr. Joshua Lederberg
Dept. of Genetics
Untiversity of Wisconsin
Madison, Wisc.

Dear J.L.

I have sent under separate cover the
two strains we used in the stationary phase
mutation studies. They ares

h-p histidine ~ lactose+ This strain
was obtained from Lampen in 1945 and was des-
ignated by him 148-334.

hvlac™” yb Although to be certain I
would have to check with the records which are
now in Japan, I think that this is a singlé
colony isolate of the mutant you sent in 1949,

We have had one letter from Japan de-
scribing the arrival end are anxiously awaiting
further news, Francis' university address is;

Institute of Applied Microbiology
University of Tokyo

Bunkyo-ku

Tokyo

Japan

Evelyn Witkin can be reached after
October 15 at:

Department of Medicine

New York State Univ. Medical School
451 Clarkson Avenue
Bklyn, NY.

OCT 14 1955
I am glad the biotin situation was finelly
straightened out.

Best regards to Dot Gosting and to Esticr,

Sincerely,

Ox.

Phyllis Fried