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This little book contains an interpretation rather than a review of the literature on hydrocephalus, the interpretation being largely in terms of the author's own viewpoint in connection with this disease. This viewpoint has apparently changed in recent years, since the author, who previously believed in the generally accepted theory that hydrocephalus is usually associated with an obstruction to the cerebrospinal fluid spaces, whether it be within the ventricles or at the point of absorption of the cerebrospinal fluid into the venous system, is now of the opinion that hydrocephalus is a "disturbance of water metabolism." "More fluid than normal enters into the brain and reabsorption is also affected, both conditions being caused by a disturbance of permeability of the hemato-encephalic barrier." As an example of this change in point of view, one may cite the author's complicated attitude toward his own belief in the efficacy of roentgen irradiation in