MEMO FROM TO: J. LEDERBERG RK Dp Slane RC GENETICS DEPARTMENT RO STANFORD UNIVERSITY STANFORD, CALIFORNIA -Of course I fully agree; in fact, I have just replied affirmatively to Mr. Riddleberger 's invitation to join the PCC. Main main concern is that we do not adopt self-defeating postures in advocating demo- cratically unacceptable means of achieving rational @imits on population growth. Garrett Hardin's rhetoric has, for example, done just that kind of harm. (I do not impute this to your organization or its leadership.) We face Similar problems in, for example, steering the course that can relieve enormous misery in genetic defects without provoking public fan- tasies about (or crude realities of) genetic engineering. Séncerely, Ene: Mchr sir