THE UNIVERSITY OF TEXAS
AUSTIN 12

DEPARTMENT OF BACTERIOLOGY

7 November, 1951

Dr. Joshua Lederberg
Dept. of Genetics
College of Agriculture
University of Wisconsin
Madison ,Wisconsin

Dear Dr. Lederberg:

We have underway a project studying various enzyme systems of some food
spoilage organisms, “ne of the systems that we would like to study ié the
beta-D-galactosidase, Wie have read with interest your paper ," The Beta-D-
Galactosidase of Escherichia coli, strain K-12 ®, which e:peared in the
Journal of Bacteriology 60 381 1950. We were wonder ing if we might impose

on you for a small sample of the o-nitrophenyl-beta-D- galactoside substrate
used in your work. We would a&kso appreciate a reprint of your paper.

Thank you for your consideration in this matter.

Very truly yours,

OB WI Ubon

OBW:lle 0O.Be Williams