USES.--It should not be given in acute diseases. It is given as a general tonic after debilitating diseases especially when the lungs are involved, as in pneumonia, bronchitis and pleurisy. Arsenic combined with bran mashes is beneficial in stocking or swelling of the legs. As for its use in chronic indigestion, other medicines had better be resorted to. It assists in the expulsion of worms. Useful in chronic diseases of the air passage. Arsenic relieves irritable chronic coughs, and roaring in early stages, as well as thick and broken wind and heaves. As an alterative modifying tissue change it is prescribed in early stages of tuberculosis, chronic rheumatism, chorea and epilepsy. It prevents periodically returning fevers. In anaemia it increases both red and white blood corpuscles. For chorea in dogs, commence with a small dose, three times daily and increase a minimum per dose every third or fourth day until the physiological limit is reached as described under (Toxicology of Arsenic). ACTIONS ON THE SKIN.--Administered internally it stimulates the dermis and hastens the removal of epidermal cells; hence it is useful in all chronic skin diseases, as chronic eczema, scab, mange and warts. To remove warts that occur in the mouth and on the muzzle of animals, give internally and apply locally Fowler’s solution. In chronic skin diseases use Donovan’s or Fowler’s solution or acidum arsenosum and sulphur mixed in the feed. Useful internally in successive eruptions of the skin boils and in chronic urticaria. EXTERNAL USES.--The white arsenic or arcenous acid is used to slough out tumors, fistulae, quittors, etc. But I would not recommend it as it is too painful. It is valuable in the treatment of foot-rot. The affected animals should be slowly driven through a trough containing a solution of arsenic. It is used extensively for sheep and cattle to destroy ticks. In this way, animals are sometimes poisoned, as it drips on the grass and other animals eat it. TOXICOLOGY OF ARSENIC.--Full medical doses if long continued, cause edema and itching of the eyelids, increased flow of saliva nausea, diarrhoea or dysentery, weak heart, soreness to the touch over the region of the stomach, itchy skin with small eruptions, jaundice and albuminuria. In long continued doses it diminishes exudation, decomposes albuminoid tissues and produces fatty degeneration; also lessens the glycogenic functions of the liver. CHRONIC ARSENICAL POISONING.--Is common in the vicinity of either tin or copper smelting plants. The symptoms are as follows: indigestion, thirst, wasting, chronic diseases of joints and bones, the knee joints swell, the animal becomes lame and hide-bound, hair falls off, skin gets rough and scurfy, teeth get black and fall out and necrosis of the bones follow.