Oetober 25, 1949.

Dr. Leland W,. Parr,

George Washington University
Dept. of Bacteriology,
Washington 5, D.c.

Dear Dr, Parr:

Thank you very auch for your kind letter and fur sending the two
ampoules of the Garrett coli strain. Howevar, I nope that these were
not all you had desiccated, because, unfortunately, the anpoules
were smashed in tne mails.

I tried, nevertheless,to reisolate the strain, and spread the glass
fragnents on au FB plate. Lactose + and lactose-negative organians
came up, but the laiter turned out not to be nutabile, so i doubt
that they coulc have been the strain I was looking for. Deere's des-
cription of the Gerrett coli~-méabile implied that they reverted to
Lact very readiiy.

if you do have a further remnant of this culiure, I would appreciate
it very much if you could send 1% to me again. I will be glad to main-
tain it here, or have it lyophilized, if you want its preservation as-~
sured.

May I enquire what technique you have been using for the drying
and preservation of bacteria? I am particularly curious about the drying
agent that can be incorporated in the same space as the bacterial deposit.
Is it silica gel?

With sincere thanks,

Sincerely,

Joshua Lederberg