C.E. CLIEZON- SUC Senet of K fe Sept. 29, 1950. Dear Dr. Clifton— I am very sorry to have missed seeing you when we visited Palo Albo this suamer, during your vacation. One of the questions I would have liked to ask you was whether you gon@d give me any deteils at all of the history of strain K-12 of EB, cold : where and when isolated; what other work may have heen done on it, and so forth, Your recent paper on oxidative assimilation of glucose by this strain reminded me to write you about it. May I ask you to keep ae in mind for a reprint of this paper and for the one following which promises to deal with the efficiency of assimilation? Thank you, Sincerely, Joshua Lederberg, Associate Professor of Genetics