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This book is an excellent monograph on the subject of the juvenile form of amaurotic family idiocy. It includes a thorough up-to-date and critical review of all previous contributions bearing on this form of heredodegenerative disease, a comprehensive summary of its pathologic anatomy, a competent discussion of the clinical manifestations with highly instructive points of diagnostic significance in the typical and atypical instances and, above all, an important study of the hereditary features of the disease. Of great interest is the account of the ingenious way in which the large material was uncovered and collected in a country where the disease was considered to be rare. The determined search for material led to a thorough genealogic study of fifty-three families and an investigation of over a thousand members of these families. It was rewarded by the discovery of a relatively large number of cases (thirty-nine); eighteen of the cases came