OCT 7 1965 DEPARTMENT OF BACTERIOLOGY AND IMMUNOLOGY HARVARD MEDICAL SCHOOL 25 SHATTUCK STREET BOSTON, MASSACHUSETTS 02115 October 5, 1965 Dr. Joshua Lederberg Department of Genetics Stanford University Medical School Palo Alto, California Dear Joshua: Many thanks for the excellent reproduction of Figure 4 of your paper with St. Clair, which arrived in four copies. I hate to bother you further, but I had hoped to have in addition an illustration of spheroplast formation in liquid medium, such as Figure 1 of that paper. This was also requested in my initial letter, and I wonder whether you would be able to get copies made without trouble for yourself, With best regards, Sincerely, Pouce Bernard D. Davis bdd/b