INDIANA UNIVERSITY College of Arts and Sciences BLOOMINGTON, INDIANA DEPARTMENT OF BACTERIOLOGY April 24, 1958 Prof, Joshua Lederberg Department of Genetics University of Wisconsin Madison, ‘fisconsin Dear Josh: Thank you very much for the cultures. They arrived in fine shape and seem to be exactly what we want, I must say that I have an increased respect for the work in microbial genetics. The experiments which sound so simple and fool-proof are giving my students trouble right and left, And this despite the fact that in the course laboratory I have only three students and they are among our best. Oh, well, I have come to expect this in student labs, but it is dis- couraging nonetheless, Thanks again and with best regards-- Sincerely yours, | Fraser DF: sh