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In the preface of this book the author emphasizes that the syndromes resulting from minor accidental injuries of the brain are inadequately known; he believes it instructive, therefore, to point out errors in diagnosis in seventeen cases in which the injury to the brain was not recognized clinically. The value of his cases lies in the long clinical observation and anatomic verification. The nature of the trauma was a blow in ten cases, a fall in six and crushing in one. Fracture of the skull was present in thirteen cases—the result of a blow in eight, of a fall in four and of a crushing injury in one. In three instances roentgenograms showed nothing abnormal. The lesion was located in the frontal area in thirteen cases, in the parietal in two and in the temporal in one. In eleven instances the injury to the brain was related to the site