TEMPLE UNIVERSITY
PHILADELPHIA 22.

BIOLOGY OEPARTMENT

December 12, 1951

Dr, Joshua Lederberg
College of Agriculture
Univ. of Wisconsin
Madison, Wisconsin

Dear Dr, Lederber g:

I am sending you
herewith some of my reprints related
to the Paramecium bursaria-zcochlorella
symbiosis mentioned in your letter
of December 6,

The subject is treated
more fully in my book; "The Biology of
Paramecium" which is now in production
by Blakiston and wich is expected to
appear late next spring.

Sincerely yours,

Ralph Wichterman
Professor of Biology