A lesson that is very difficult for many of us to learn is that inflamed eyes should not be used actively. Children with sore eyes should not be allowed to go to school for two reasons. First, the use of their eyes in reading will prevent or retard their recovery. Secondly, sore eyes are usually communicable, and one such child may infect a whole school. It is highly important that all persons with inflamed eyes should use only their own wash basins, towels, and handkerchiefs, and so avoid spreading the disease. We not infrequently see a catarrhal inflammation of the eyes run through a whole family. Of course, they catch it one from another, and, as there is no disease of the eye which is, like measles, or scarlet fever, or smallpox, communicable through the air, such spread of the disease might easily be prevented by proper care of the person first affected. Persons whose eyes are sensitive to light should not be kept in dark rooms, which are always unhealthy. They may have their eyes protected by shades or by smoke colored glasses, but should keep them open and exposed to the air, and should remain out of doors as much as possible. EFFECT OF ALCOHOL AND TOBACCO UPON THE EYES. I must not close without warning my hearers against the baneful effects of alcohol and tobacco upon the eyes. It is not uncommon for the eye surgeon to meet with persons who have become partially blind from the effects of these poisons upon their optic nerves. Of course, only a small proportion of those who use alcohol and tobacco to excess are affected in this way, but this renders it none the less certain that impaired sight is one of the dangers that we may avoid by abstaining from the use of these unnecessary and poisonous luxuries. TUMORS OF THE BLADDER. DIAGNOSED BY MEANS OF THE ELECTRO-ENDOSCOPIC CYSTOSCOPE. By Dr. MAX NITZE.