Dr Richard Gelderd [stamped, FEB -- 7 1983] Collegiate Review Sam number Thank you. Yes, I have something concrete in mind and I will deliver it by March 25: "the structure of DNA and the complexity of the human organism". Please trust me to tune it to your audience. Thank you for your note about David. He does seem much calmer now that his choices (and self-image) are crystallizing. Sincerely, Joshua Lederberg