STANFORD UNIVERSITY MEDICAL CENTER STANFORD, CALIFORNIA 94305 © (415) 321-1200 STANFORD UNIVERSITY SCHOOL OF MEDICINE DE C 2 3 196 9g Department of Genetics Professor Joshua Lederberg Dear Dr. Roe-- I would be grateful to you for reprints of your papers on chemical carcinogenesis. May I particularly call your attention to the problem raised by allyl isothiocyanate. ‘The glue mfrs. have in fact been deterred by the mutagenic, and by inference, carcinogenic potentials of this material, and it surely would not be useless to have more information on its effects in mammalian systems (along the lines of your studies with citrus oils). Yours sincerely,