February 12, 1952

Dr. J. S. K. Boyd

Wellcome Laboratories of Tropical Medicine
183 Euston Road

London NW 1, England.

Dear Dr. Boyd:

I would appreciate the favor of a reprint of your paper on the relationship
between lytic and lysogenic phage in Salmonella that appeared in J.P.B. last
year. I regret that by inadvertence, you name has escaped my mailisg list;
this will be corrected promptly. The enclosed will give some ckues to tke
directions of our interest. Please note that in K~12, sensitive x sensitive
crosses are fully fertile, contra various speculations.

If you can spawe a second copy, “&. Zinder would, like to have a rep&int
of the same paper.

Sincerely,

Joshua Lederberg