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The fourth edition of this work differs little from its predecessor, although alterations have been made here and there to bring the work up to date. There have been few changes in the illustrations. This is not a textbook in the accepted sense of the term; it is more a series of articles on various subjects, in which the discussions are adequate, but not full. For example, the subject of tumors of the brain, including both cerebral and cerebellar tumors, takes fifty pages, and aphasia, apraxia and agnosia seventeen pages.