October 15, 1949.

Dr. Rob't Guthrie,
Dept. Bacteriology,
Univ. of Kansaa,
Lawrence, Kansas.
Dear Bob-
I just wanted to ask you how you were coming along,installed in your
new position, and also particularly to remind you of your agreement (7?)
to send me the coli which purportedly shifts from Gal+Lac- to Gal- Lac+/

Id it so?

Sincerely,

Joshua Lederberg