There is much that should be remembered about those days of intensive exploratory work and much of it using very simple methods and instruments. There was a remarkable amount of sharing of current work and results without much concern for primacy, which was automatically recognized. Communication was often by hand written notes exchanged with people on a card by mail who were then or later notables (including Lederberg and Luria) with news or questions from the lab bench. There were relatively few workers in the early days and we knew each other and what was going on. Delbruck would send a post card with the penciled statement: "Phage meeting Aug. 14th". So here's a paragraph for you.
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