October 19, 1978 Dr. Joshua Lederberg, President Rockefeller University New York, New York 10021 Dear Josh, The "DNA as Program" analogy has led me to an intriguing idea, which is described herein. Because of the significance of the concept (if it’s true), I am concerned about how to proceed. Could you please look this over, and suggest a reasonable course to follow (should I collaborate with X here at Stanford, should I wait N years until more data is collected,...)? Knowing how busy you must be, I will appreciate any time you can spare for this. Incidentally, if you want to call me at home (11-12 your time is good), my number is 415-965-1228. Regards, Day, Douglas B. Lenat \ __β€”_β€”β€” DBL: bae COMPUTER SCIENCE DEPT., STANFORD UNIVERSITY, STANFORD, CA. 94305 . (415) 497-4878 x35