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This valuable monograph is founded on a series of twenty-one cases observed by the author and in which he operated. The cases are described in sufficient detail, and the illustrations are plentiful and graphic. Five of the tumors were colloid cysts; the remainder were chiefly gliomas of various sorts. Dandy's operative results were remarkable. In all instances the tumor was removed. The gross mortality was 33.3 per cent; however, in the last fourteen cases there were only two deaths. Forty-seven cases are assembled from the literature, in none of which the diagnosis was made during life; this should not be interpreted, however, to mean that no successful operations have been reported.
From an analysis of the whole material, Dandy concludes that the symptomatology of tumors in the third ventricle is not particularly characteristic. Suggestive manifestations are: (1) loss of pupillary reflexes; (2) intermittent attacks of various kinds, e. g., headache,