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In this modestly entitled work the author presents the results of much clinical and experimental study with conclusions based on the known data from the ophthalmologic practice of other authorities. His main thesis is that there is no one "glaucoma" or even one "hypertension," but various conditions of stable or unstable equilibrium between "two mobile' fluids contained within and separated by permeable walls," so that hypertension may be static or equilibrated, dynamic or unbalanced and, finally, compensated. Insisting on the fallacy of a uniform denomination and on the futility of theoretic generalizations, Bonnefon points out that treatment may be medical or surgical or both, and may vary in a single form of hypertension, according to the degree of evolution. In the course of this treatise he gives interesting and instructive data on the factors determining intra-ocular tension, scleral permeability, the circulation of the aqueous, choroidal circulation,