september 7 ’ 1948.

Dr. D. 7. Noolley,
Rockefeller Instituts for Vedical Research, |
York Avenue & 66 Street,

New York 21, ele

Dear Dr, Woolley,

fn your paper “Solective reversible inhibition of microbial growth
with pyrithiamine", appearing in the J. Fape Meds, Dec. 1943, I noted your
references to a culture of 5. gallinurun waich rojulired both the thiazole and
pyrimidine components of thiamin,

While retesting the nutrional requirements of sons of my Salnonalla
cultures, in the nutrition of which I an greatly interested, I noted that
my Oulture of 5S. gallinarug, received from Borman at the Conn. Public Health
LabSe, responded only to thiazole,

For comparative purposes, and because of wy interest in £tra-type nuti-
tional varfation, I would like to have your gallinarun culture, and would
greatly appreciate receiving it from you. If you have not kept it going, per~
haps you have a culture nunber that could idsatify it if I corresponded with
lettiger's iab. at Yale,

With my thanks for this fevor, and ay best regards,

Yours sincerely,

Joshua Lederberg
Assistant Professor of Genetics.