That the qualitative, as well as the quantitative, response to the local administration of miotics varies greatly with the various types and stages of glaucoma is a common, if not daily, experience in the practice of ophthalmology. It has been the subject of extensive discussion in the literature, although during the last decade more stress seems to have been laid on the effect of new miotics, and not so much on their specific effect in certain types of glaucoma. Since the advent of gonioscopy, progress seems to have been made with regard to the sharper definition of some forms of glaucoma, and it appears worth while to review a series of cases of conservatively treated glaucomas with the aim of determining to what extent gonioscopically defined types of glaucoma possess the quality of responsiveness to miotics, or, more specifically, whether responsiveness to miotics has a gonioscopic correlate. It would obviously