Department of Genetics
University of Wisconsin
March 31, 1952

Dear Dr. Wahl:

I enclose a culture of a V;” mtant of E.coli K-12. If you wish,

I will be pleased to send you other materials, but I think you can
obtain them conveniently in Paris. Dr. Lwoff has the original K-12
strain, and there is no difficulty with obtaining the usual V,*" mutant.
The phages Tl and T5 are probably obtainable from Latarjet, oF Wollman
if not directly from Lwoff also. Tih is any one of a number of host
range mutants obtained by plating Tl with B/1 (not B/1,5).

I have a brief mention of this mutant in a chapter in "Genetics in
the Twentieth Century" published last year by MacMillan and Company, N.Y.
UnSSrtunately, reprints have not been prowided.

Please let me know if you have any difficulties. The paper in the
silica-gel tube should be suspended in nutrient broth; the gel granules
will do no harm, Also please let me know if the other cultures and
phages are nob readily obtainable.

ank you for the reprints.

Sincerely,