The volume embodies an experience of about five thousand extractions. This is a comparatively small experience for an ophthalmic surgeon of standing in India. But on this account the material has been, perhaps, more completely handled and investigated than if the numbers had been larger. In busy seasons Indian surgeons have barely time to perform their operations, and can see little or nothing of the cases afterwards. For years I have jotted down facts and ideas regularly as they came, and have developed them for teaching purposes, both in hospital and in the lecture theatre. The present work has, in a sense, grown out of an earlier publication ' The Practical Details of Cataract Extraction ' of which two editions were published in 1903.