This dark brown tincture is not often used internally, but is used as a sweat blister and for blistering thickened glands. In using, take a feather, painting the iodine on the lump until it blisters; when the blister appears, grease the part; after two or three days have passed, wash the lump with warm water and soap and blister again. IODIDE OF POTASSIUM This white powder is obtained from the mineral kingdom. When given internally it acts as an absorbent. It is commonly used in cases of dropsy of the belly. In administering, use equal parts of ground gentian root and give twice a day. Dose: For horses and cattle a teaspoonful; for sheep and pigs, one-half teaspoonful. LINSEED OIL This oil is obtained from flaxseed, and is excellent when a mild physic is desired. The easiest and most effective way of giving to animals is in the form of a drench. About 1 pint should be used for horses and cattle. Raw linseed oil is usually preferred to the boiled. LAUDANUM This is made from opium and is used both internally and externally. It is commonly used where there is pain, hence it is excellent for relieving pain and spasms and assists also in checking inflammation. Dose: For horses and cattle, 4 to 6 teaspoonfuls; sheep and pigs, 2 to 4 teaspoonfuls. NUX VOMICA This powder comes from ground seeds, and is used as a nerve stimulant. It is very efficacious for strengthening weak, debilitated animals. A common way is to mix equal parts of gentian and powdered nux vomica thoroughly together. This may be given as a drench, or in the feed or placed at the back of the tongue with a spoon. Dose: For horses and cattle, 1 teaspoonful three times a day; for sheep and pigs, one-half teaspoonful. NITRATE OF SILVER This comes in the form of white penciled sticks. It is excellent for burning off warts, proud flesh in cuts and growths on any part of the body. Just wet the stick and rub it on the parts. Of course, be careful that your fingers are protected from the chemical. It is a poison taken internally. NITRATE OF POTASH This is frequently called saltpeter, and comes as a white crystal or powder. It is used for kidney, lung and blood troubles. It has a very acute action on the kidneys, causing them to secrete an extra amount of urine. Dose: For horses and cattle, 1 teaspoonful; sheep and pigs, one-half teaspoonful. SULPHATE OF COPPER This is commonly known as blue vitriol or bluestone. It is excellent when given internally for checking discharges, especially those of a chronic catarrhal nature. It may also be used as a wash for wounds, when a weak solution is made, and may be dusted on the wound every day or two in case proud flesh forms. SULPHATE OF IRON Green vitriol, or copperas, as it is commonly known, is a splendid mineral tonic, and is commonly used in combination with gentian, equal parts of the two. Use when the system is badly run down. It is also excellent as a worm powder.