UNIVERSITY OF MICHIGAN

MEDICAL SCHOOL
ANN ARBOR

DEPARTMENT OF BACTERIOLOGY November 12, 1954

Dr. Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Josh:

In our current course in bacterial physiology, we plan
to conduct a K-12 recombination experiment. Cavalli's
visit yesterday and today helped immeasurably to clear
up some procedural points of the experiment, in addition
to which his seminar was perfectly timed for the class.
As you have, we found his wife and him wonderfully
stimulating and likable.

May I impose on you to send cultures of K-12 strains
58-161 (M-, F+, sugars+, T¥,5, StS) and W-1177 (Thr-,
L-, F-, Thiamin-, Lac-, Malt-, Xyl-, Ara-, Man-,
Te 5, stR) ? Will you please correct me, if Iam off on
any of the indicated markers. I understand that you sent
these cultures to Al Campbell last year, but they became
lost by unilateral induction.

Josh, thank you for the help. Please pass along my hello
to Esther and to friends in Ag Hall.

(Coraiadry,

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PG:br Philipp Gerhardt