Department of Genetics
University of Wisconsin
Madison 6, Wisconsin

March 20, 1952

Dear Dr. Boulgakov:

I have recently been given to understand that I could reach
you at the Pasteur Institute, and hope this letter arrives in
good form.

I am writing to inquire about the flagellar phages that were
described in 1836 by Sertic and yourself. We are condubéing some
investigations on the genetics of the flagellar antigens in
Salmonella for which such phages would be most useful. Unfortunately,
I have not bean able to obtain any further information about
them except for the article by Rakieten and Bornstein. I have con-
sulted Dr. Rakieten in New York, and he regrets that kis cultures
have been lost.

Would you be kind enough to tell me about the current status
of your phages? If your cultures are no longer viable, can you
advise ma as to the best procedure for isolating this type of
phage? If your 1936 preparations are still recoverable, would
it be too much to ask to have them sent to us?

We should be most appreciative of these favors, as well as of
your reply to this letter,

Yours sincerely,

Joshua Lederberg
Associate Professor of Genetics