DIVISION OF SCIENCE SERVICE

BOTANY AND PLANT PATHOLOGY

 

DEPARTMENT OF AGRICULTURE Drawer 940,
Fredericton,N.B.,

August 6,1953.

Dr. J. Ledeberg,
Department of Genetics,
University of Wisconsin,
Madison, Wisconsin.

Dear Dr. Ledeberg:

I have been searching over the Continent for
a culture of E. coli, which has a requirement for proline.
Have you and could you favour us with a sub culture of the
organism,or could you direct us to some source having
this material?

Yours very truly,

1% ,
@ Poy IR
J. L. Howatt,
Plant Pathologist.

J LH/VL