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EDITORIAL OFFICE May 15, 1952

Professor Joshua Lederberg
The University of Wisconsin
Department of Genetics
Madison 6, Wisconsin

Dear Professor Lederberg:

We are very appreciative of your kindness in sending us your note

of May 8 with the correction of the error in the paper of Drs. Mor.od
and Cohn. Unfortunately, the correction had to arrive by hay lst

in order to be made. We are,however, forwarding your note to Dre
Nord, who will no doubt wish to include the change on the next
errata slire

Very sincerely,

INTSRGCIZNCE PUBLISH 25,10.