The accounts of this operation found in the larger textbooks of ophthalmology are generally unsatisfactory, that of Fuchs being least so. Better descriptions, both as to indications for the operation and technic, are found in special works dealing with ophthalmic operations, especially in Beard's "Ophthalmic Surgery"; and the best description is given under the head "Discission" in the American Encyclopedia of Ophthalmology. The great variations that occur in the behavior of the eye following this operation, however, are poorly reflected in any condensed account of it. They are best shown by rather full extracts from a series of case histories, six of which are given here with brief comments. In all these cases the needle was introduced through the limbus, as I have described elsewhere.1For the first entering of the lens I prefer a rather broad needle, as the Bowman stop-needle, or the medium size of Knapp's knife-needles,