February 25, 1952

Dr, P. R. Edwards
Communicable Diseases Center
P.H.S., Box 185

Chamblee, Georgia

Dear Dr. “dwards:

Thank you for the cultures and sera that arrived today. We are
especially grateful for the latter as an unrequedted gift that will
be of some help in eking out our current supplies.

It should have occurred to us sooner to use the IX,XII, 1-— hy-
brid as a source of anti-1 serum. We should be testing ite agglutinogenic
powers anyhow, and will let you know how it works.

We sent our ms. to the journal a few days ago. The revhhions were
ao extensive as to require a re-typing, so we are pleased to be able
to send you the enclosed uncorrected draft for your use until the paper
appears in print. Your question as to the least fussy method of producing
FA is answered on p. 4. The stock we sent you that carries your number
4760-51 can be used as one component (LA- or LT-2). We will be pleased
to send you the other, LT-22, upon request, although you would probably
have no diffaduity in finding a typhimuriua ffrom your own collection
that would be carrying a suitable latent phage.

I am also enclosing a briefer account of our Salmonella work, taken
from a progress report to the NIH. This should be regarded as a private,
though not confidential, communication. This report also refers to an
entirely unrelated bit of work, replica~plating that I thought might
be useful for some routine laboratory operations-- at least I hope so,
A sample of the fabric is enclosed; we ordinarily cut sheets about 5"
square, and mount them with a hoop on a wooden cylinder (somewhat after
the fashion of an embroidery hoop).

I hope you are not disturbed by the exuberant tonevof the progress
report: this seems bo be in the nature of things.

Yours sincereky,

Joshua Lederberg