WAYNE STATE UNIVERSITY wY COLLEGE OF LIBERAL ARTS DETROIT 2, MICHIGAN DEPARTMENT OF CHEMISTRY February 9, 1961 Professor J. Lederberg Department of Genetics School of Medicine Stanford University Palo Alto, California Dear Professor Lederberg: There is no doubt that youfplans on determining light scattering properties of bacterial suspensions are a very good idea and much information can be derived. I recall that many years ago the method was used in France in order to follow the rate of multiplication of bacteria. I will be sending to you under separate cover pertinent reprints + on work done here. Unfortunately, I am out of some on experimental work. As regards the purely technical problem of these measurements, you may not find all that you want for the simple reason that periodicals are very often reluctant to publish experimental details. I, therefore, generally publish on the assumption that the reader already has some acquaintance with the background of the technical problems, If there are any matters of detail with regard to theory or experi- mental technique that you should like to familiarize yourself with, please feel free to stop at my laboratory on your next trip east. My collaborators and I shall be glad to make you acquainted with our technique. Yours sincerely, Sefarect freceer Wilfried Heller Professor of Chemistry WHsve * Thanks we: r precede ¥ Da wrt haar & Corvemnck hist og flrese ?