“Most of the significant work has been summarized in a number of reviews and articles. In these there was, of necessity, a good deal of simplification and omission of detail …. With the passage of time, even 1 find myself accepting such simplified accounts.”

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Author notes

The Nobel lecture given on December 8, 1993 by Dr. M. Smith and published in Les Prix Nobel 1993, printed by Norstedts Tryckeri, Stockholm, Sweden 1994, republished here with the permission of the Nobel Foundation, the copyright holder.