Internally the inhalation of the fumes of tar, carbolic acid, creolin, oil of turpentine, or of burning sulphur kept up continually or frequently repeated. Giving all drink in the form of tar water will often have a good effect. Electuaries made with boric acid, salicylate of soda, ammonium chloride or iodide, borax, with honey, molasses, liquorice, Iceland moss, or gum arabic will often prove beneficial. Agents that stimulate the mucosa may follow, such as balsams of Peru or Tolu, copaiba, cubebs, pilocarpin, wild cherry bark, or these may be combined with the former. Finally a course of tonics are usually of the first importance; iron sulphate, copper sulphate, arsenious acid, arsenite of strychnia may furnish examples. DEPRAVED APPETITE. STUMP SUCKING. PICA. LICKING DISEASE. Common features of group. Ruminants; depraved appetite; objects swallowed: hair balls. Sheep eating wool in winter. Pigs eat bristles. Puppies swallow marbles, etc., wantonly. Solipeds swallow hair, plaster, earth, sand, and lick manger or rack. Fowls eat their feathers. Causes: soil exhaustion, lack of lime, soda, potash, phosphorous; relation to osteo malacia; granitic or sandy soils, peat, muck, causative; digestive disorder; faulty food; yearly breeding and heavy milking; constant stabling; dry seasons. Course: chronic. Lesions; emaciation; anæmia; serous exudate; catarrh of the bowels. Treatment: soil; good fodder; salts of soda, potash and lime, phosphates; tonics; apomorphine. Wool eating; example: digestive disorders; emaciation. Treatment: open air; good fodder; salts of the bones and soft tissues; clip nurses; apomorphine. _Definition._ We have here a class of morbid habits, which cannot be referred to any constant lesion or group of lesions, and which appear in certain cases to result from example and to constitute nothing more than a bad habit.