in a darkened stable, give green or sloppy
feed, and administer 4 ounces of Glauber's salt (sulphate of soda)
dissolved in a quart of water once a day. If the animal is debilitated a
tablespoonful of tonic powder should be mixed with the feed three times a
day. This may be composed of equal parts by weight of powdered copperas
(sulphate of iron), gentian, and ginger. As an application for the eye,
nitrate of silver, 3 grains to the ounce of soft water, with the addition
of 1 grain sulphate of morphia, may be used several times a day. If
ulceration occurs, it is well to dust powdered calomel into the eye twice
daily, or apply to the eyelids a salve of yellow oxid of mercury, 5 per
cent in lanolin. Some of this may go on to the cornea and beneath the lids.
Apply twice daily. (See "Ulcers of the cornea.")

To remove opacity, after the inflammation has subsided, apply a few drops
of the following solution twice a day: Iodid of potassium, 15 grains;
tincture sanguinaria, 20 drops; distilled water, 2 ounces; mix.

Sometimes keratitis exists in a herd as a transmissible disease, spreading
like infectious conjunctivitis. Calomel, applied to the eye, is especially
useful in such cases.

ULCERS OF THE CORNEA.

An ulcer comes from erosion or is the consequence of the bursting of a
small abscess, which may have formed beneath the delicate layer of the
conjunctiva, continued over the cornea; or, in the very substance of the
cornea itself, after violent keratitis, or catarrhal conjunctivitis. At
other times it is produced by bruises, scratches, or other direct injury of
the cornea.

_Symptoms._--The ulcer is generally at first of a pale gray color, with its
edges high and irregular, discharges instead of pus an acrid, watery
substance, and has a tendency to spread widely and deeply. If it spreads
superficially upon the cornea, the transparency of this membrane is lost;
if it proceeds deeply and penetrates the anterior chamber of the aqueous
humor, this fluid escapes, the iris may prolapse, and the lens and the
vitreous humor become expelled, thus producing destruction of the whole
organ.

_Treatment._--It is of the greatest importance, as soon as an ulcer appears
upon the cornea, to prevent its growing larger. The corroding process must
be converted into a healthy one. For this purpose nothing is more reliable
than the use of solid nitrate of silver. A stick of this medicine should be
scraped to a point; the animal's head sh