The paperback edition of this authoritative work is to be warmly welcomed. On its first appearance, the book was widely acclaimed. It is full of illuminating insights and in scope goes far beyond a matter of mere definition. It is the kind of instructive book that should be kept close at hand on a readily accessible shelf. Its definitions, while up-to-date, take cognizance of historical changes of meaning and it is of value both to the student and to the knowledgeable reader.