Dr Joshua LEDERBERG

ASSociete Professor of Genetics
Department or Genetics

The University of Wisconsin
College of agriculture

MADISON 6 (Wisc.)

Oct.17tn, 1950.

Deer Dr.Leaerberg,

Thank you very much for your letter
datea Octoler ll, 1950. I am senaing reprints'by orui-
neury mail. May I ask tne favour tnat my nume bg polaced
upon your mailing list for reprints.

I shall be very glea to test the
beheviour of your E.coli strain «.1lé towxrdas colicins
and compere it with the types in my collection. Please,
senda me the strain «s soon es possibile as I aw just
now engaged in testing other strains. If@woulu be of
interest to me to get also, if possible, un indicator
Strain to its lysogenic action.

AS regerd "direct antagonism" I have
no experience on the subject. Ir you want, you may sena
also strain W-1176 ana I shall book ror en antibiotic
action by the methous usea to denonstrate the production
of colicins.

I am very sincerely Yours

hod. Vrs

Dr.P.FREDERICG
Agregé.