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N F Mott and E A Davis London: Oxford University Press 1971 pp xiii + 437 price £7·50 It is hard to think of a physicist other than Professor Mott who would be able to attempt successfully a book of such a broad compass and in Dr Davis, a specialist in the field of amorphous semiconductors, he has found an ideal co-author. The book is divided into two parts: the first deals with the theory of electrons in a noncrystalline medium and its application to liquid metals, amorphous semimetals and semiconductors.
R. A. Street (Tue,) studied this question.