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This monograph is a systematic review of the symptomatology, pathology and surgical treatment of tumors of the posterior fossa, based on experience with one hundred and thirty-nine cases. While there is not much new material in the book, aside from the histories of cases, conclusions from the literature are carefully criticized point by point on the basis of the authors' experience. They call attention to the importance of vomiting as an early localizing symptom of tumors of the posterior part of the fourth ventricle and the prognostic significance of this manifestation. Vomiting may also be produced by irritation of the anterior part of the third ventricle. The early abolishment of the pupillary reflex may also be taken as a localizing sign in this instance of involvement of the corpora quadrigemina. Mental disturbances, especially confusion and depressive stages, may result from increased intracranial pressure. An excellent review is given of the