UNIVERSITY OF ILLINOIS DEPARTMENT OF BACTERIOLOGY 362 NOYES LABORATORY OF CHEMISTRY URBANA Dr. J. Lederberg Department of Genetics University of Wisconsin Dear Joshua: Thank you for the cultures. I mn't think we are going to study the adsorption rate, since the student that wanted to work on this problem as a class project has decided on a different problem, I shall, however, keep the cultures in stock in case they may be needed for other purposes, Sincerely yours, S. BE, Luria SEL/JH