UNIVERSITY OF CALIFORNIA
COLLEGE OF AGRICULTURE
AGRICULTURAL EXPERIMENT STATION

DIVISION OF FOOD TECHNOLOGY
BERKELEY 4, CALIFORNIA

July 30, 1951

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

Dear Dr, Lederberg:

I have been delayed in answering your letter of July 8 by a variety

of things, including field trips. The cultures which my assistant
sent were cultures which we had identified as either Escherichia
freundii or E, intermedium. I would not personally call these
aberrant coliform types. 1 have no cultures at the present time in
my collection which would fall in this category, I have somewhere
near a thousand cultures of coliforms in my collection at present,

but at least 90 per cent of these are representatives of the E, coli
group, and we are just beginning to look into some of their species
characteristics, From time to time I get a number of intermediate and
aerobacter types. If you so desire I can send intermediate and unusual
types as they come to our attention, Unfortunately the large collec-
tion I had originally was slowly dissipated through neglect during the
war period,

I would be very grateful if you would send me copies of your reprints.

I am very sorry that we did not get to see each other in Chicago.
I was busy trying to run down som industrial contacts and was in and
out of Chicago during the time of the meetings.

Very truly yours,

Oe @ lhag he

Reese H, Vaughn

RHV:ECC