ISTITUTO DI GENETICA UNIVERSITA DI PAVIA VIA SANT’EPIFANIO, 14 27100 - PAVIA Dear Josh: - Pavia ing. the Atlantic). Best regards. Telefoni: 31.036-7; 29.038 - Indirizzo telegrafico: Istgenetica January 13, 1971 Dr. J. Lederberg Department of Genetics Stanford Medical School Stanford University Palo Alto - California (U.S.A.) It was a real pleasure to see our names on a paper. If you send us some reprints I may answer the requests that are arriv-— Luca, our tricontinental man, has just left for Africa. He will be back in Europe at the end of the month and leave imme- diately for America. We hope to see you sometimes this year (on either side of Yours, Que