In this discussion it is our design: (1) to call attention to a recent development in the treatment of glaucoma; (2) to present a new, hitherto undescribed technic which, we believe, has many advantages over procedures used to date, and (3) to report our experiences with indications, complications and results based on operations in 32 cases. Furthermore, we should like to make some comments on the possible mode of action of the operation used and to report some experimental work. The concept of the treatment of glaucoma by reducing the amount of aqueous formed is by no means a new one. In 1890 Wagenmann,1 working with rabbits, observed that a reduction in intraocular pressure occurred when he cut the long posterior ciliary arteries. Recently Fortin2 called attention to a similar observation. Heine3 in 1905 first used the idea clinically when he performed cyclodialysis. He said, and there