UNIVERSITY OF ILLINOIS

DEPARTMENT OF BACTERIOLOGY

362 NOYES LABORATORY OF CHEMISTRY
URBANA

September 7, 1956

Dr. Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison 6, Wisconsin

Dear Josh:

Enclosed please find the two acknowledgement copies
of the cultures which you sent.

The cultures are all in fine Shape with no exceptions,
We are now finishing up a survey of their inducibility comparing
lactose with alkylgalactosides as inducers of intact cells » proto-
plasts, and shockates. Iwill send you a summarized table in the
near future. JI think you may find the results somewhat amusing.

My best regards both to you and to Esther, and many
thanks for the material.

Sincerely yours,

JA

S. Spiegelman
Professor of Bacteriology

SS: jb

Enclosures

Ps Re prin have han distibtis