Abstract

Hanson has set forth in a fascinating way the story of the discovery of the positron. He takes up in some detail the question concerning the symmetry of explaining and predicting, argues that certain features of microphysical theory cannot be accommodated to mechanical-type models, and defends his interpretation of the "Copenhagen" view of quantum theory. He shows how an adequate understanding of these matters makes possible a grasp of the significance of the concept of the positron, and in so doing, illustrates the complex relationships in which physical theory stands to observation and experiment. Consequently, Hanson's book is another of the recent works in which an author refuses to construe the scientific enterprise as a sophisticated search for facts, where so-called theoretical entities serve as mere devices to make calculation easier. The book includes four appendices of a rather technical nature and 41 pages of notes on the text.--C. V.