Electron theory: Description and analogy

It is a very special sort of privilege to give this lecture in honor and in memory of Carlson who was, for many of us, both a friend and a colleague. It is certainly appropriate that, as we mourn his loss, we try, as well as we can, to do the kind of thing that he did when he was with us, that he would approve and did approve in his life. It is, of course, also a great pleasure for me to be here in Ames, at a growing and already very famous center of study in many fields, including physics, Carlson's specialty.