UNIVERSITY OF CALIFORNIA
COLLEGE OF AGRICULTURE
AGRICULTURAL EXPERIMENT STATION

DIVISION OF FOOD TECHNOLOGY
BERKELEY 4, CALIFORNIA

Mareh 15, 1951

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

Dear Dr. Lederberg:

I have read your letter of March 1, 1951, with a great deal of in-
terest, but field work has delayed my reply. I have only a few of the in-
termediate coliforms referred to in your letter, However, I do have addi-
tional intermediate forms which I have isolated from food products. You are
perfectly welcome to any or all of these cultures if you will let me know how
many you want and five me time to check their purity.

I shall have to ask one of my students about the cellobiose ferment-
ers. He has just recently been characterizing some isolates and has that in-
formation in his own file at present. Inasmuch as he works in the Laboratory
only at night and on week-ends now, I shall not be able to contact him until
Saturday, I shall let you know about the availability of such cultures in
another letter.

During the Chicago meeting I would very much welcome the opportunity
to talk with you about your work, if you expect to be there, and if the time
can be arranged. As you know, I have been interested in the coliform group
since I began my graduate studies, and fortunately I have been able to contin~
ue some of the work here. I have tried many times to convert coli into aero~
genes and vice versa, but without any luck, although I have not tried your
technique.

I shall attempt to get as complete a collection of reprints as are
still available and send them to you under separate cover.

Yours very truly

RHV sel Reese H. Vaughn
sep cover