476. Collyria, or Eye Washes.
477. Alum.--Dissolve half a drachm of alum in eight ounces (half a pint) of water. Use as astringent wash. When twice as much alum and half as much water are used, it acts as a discutient, but not as an eye-water. Note that this and the following washes are for outward application only.
478. Common.--Add half an ounce of diluted acetic acid to three ounces of decoction of poppy heads. Use as anodyne wash.
479. Compound Alum.--Dissolve alum and white vitriol, of each one drachm, in one pint of water, and filter through paper. Use as astringent wash.
480. Zinc and Lead.--Dissolve white vitriol and acetate of lead, of each seven grains, in four ounces of elder-flower water; add one drachm of laudanum (tincture of opium), and the same quantity of spirit of camphor; then strain. Use as detergent wash.
481. Acetate of Zinc.--Dissolve half a drachm of white vitriol in five ounces of water. Dissolve two scruples of acetate of lead in five ounces of water. Mix these solutions, then set aside for a short time, and afterwards filter. Use as astringent wash; this forms a most valuable collyrium.
482. Sulphate of Zinc.--Dissolve twenty grains of white vitriol in a pint of watr or rose watr. Use for weak eyes.
483. Zinc and Camphor.--Dissolve a scruple of white virtiol in ten ounces of water; add one drachm of spirit of camphor, and strain. Use as a stimulant.
484. Compound Zinc.--Dissolve fifteen grains of white vitriol in eight ounces of camphor water (Mistura camphoræ), and the same quantity of decoction of poppy heads. Use as anodyne and detergent wash: it is useful for weak eyes.