14th April 1959 ISTITUTO DI GENETICA Prof. Joshua Lederberg, UNIVERSITA DI PAVIA Department of Genetics, oe Stanford University, PAVIA Stanford, California. VIA SANT’ EPIFANIO, 14 - TEL, 23,029 Dear Joshua, I am sorry that the enclosed letter was opened by mistake. This is a short note to tell you that I am just back to work after a couple of weeks of retirement, forced on me by chicken pox. I wonder if you have by now made a prograime for your trip to Europe, and, if so, will you please let me know about it. I hope that everthing is well with you and Esther, and that Peter Sneath had no trouble in having my car registered in his name. We are looking forward to seeing you both, Yours, Aa CAL Enel.