3. _Acute iritis_ not infrequently occurs after extraction. It usually comes on about the third day and may be accompanied by hypopyon. It may settle down under atropine, leeching, and dry heat, but may also pass on into the more chronic form; adhesion of the iris to the capsule, however, frequently results. More rarely the disease may not make its appearance till two or three weeks after the operation (latent sepsis), the patient suffering from recurring attacks of hypopyon. In these cases in which the hypopyon persists, washing out the anterior chamber with peroxide of hydrogen (10 vols. %) and the administration of a vaccine is of service. 4. _Chronic irido-cyclitis_ is usually primary, but may occasionally follow an acute attack of iritis. Of all the disastrous complications, this is by far the worst. It may not only destroy the sight of the eye on which the operation has been performed, but may set up sympathetic ophthalmia in the other eye. The eye does not settle down well after the operation, there being usually some prolapse of the iris or capsule into the wound. It remains injected or flushes up on exposure to light. After a time (usually about the end of the third week) keratitis punctata makes its appearance, and the tension of the eye may become decreased or occasionally increased. The disease may resolve or go on to shrinking of the globe. Energetic treatment with atropine and hot fomentations locally, with the internal administration of iron, is indicated. The administration of staphylococcus vaccine causes only temporary improvement in most instances. In six cases so treated by the author the improvement was only temporary, in spite of the fact that there was a definite local reaction to the vaccine and in two cases the staphylococcus albus was isolated from the fluid in the anterior chamber. If at the end of two months the eye be red and well-marked keratitis punctata be present, and if the pupil be beginning to be drawn up and the eye shows no tendency to improve, enucleation should be seriously considered; this is especially advisable if the projection of light has become defective, showing that the retina is probably detached. If any signs of sympathetic irritation, such as mistiness of vision, ciliary flush, or photophobia, appear in the eye which has not been operated on, the exciting eye should be enucleated. On the other hand, if well-marked inflammation has developed in the sympathizing eye, which may also be cataractous, and the other eye has a fair amount of vision, it becomes extremely questionable whether it is advisable to enucleate the exciting eye. Every case must be judged on its own merits according to the extent and severity of the disease. In a few cases in which the incarceration of the capsule in the wound leads to a very chronic cyclitis, its division with a cutting needle will sometimes lead to subsidence of the inflammation. It is most important that every eye