UNIVERSIDADE DO BRASIL

INSTITUTO DE BIOFISICA
AV. PASTEUR, 458
RIO DE JANEIRO — BRASIL

October 3rd 1952.

Dr.doshua Lederberg
Department of Genetics

The University of Wisconsin
Madison 6, Wis.

U. S. A.

Dear Prof. Lederberg,

Thank you very much for your letter of September 24
and for having sent the subcultures of K-12 and its mutant.

I am most appreciative of your kindness, and shall
be glad of any opportunity to be of service to you.

Sincerely yours,

in Ail [Eo

. A. Elias