Bathe the affected part twice a day with wafer in which a little vitriol has been dissolved, (the size of a large horse-bean to a pint of spring water,) and, in a minute or two, wash it in clear water. Or, bathe it with the following lotion twice a day:

Sulphate of copper, one scruple; Water, four ounces.

Or, bathing the forehead and eyes externally with tar-water, very profusely, has an excellent effect in all cases either for horses or dogs. It was much used in Hospital practice, by the late Dr. Physick of Philadelphia. In this case there is no danger of injury by making it too strong.