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Caution.--It is a most powerful poison. 782. Mechanical Remedies. These comprise anthelmintics, demulcents, diluents, and emollients. 783. Anthelmintics. These are medicines given for the purpose of expelling or destroying worms. They are cowhage, scammony, male fern root, calomel, gamboge, tin, and turpentine. 784. Cowhage Cowhage is used to expel the round worm, which it does by wounding it with the fine prickles. Dose of the confection, for a child three or four years old, a teaspoonful early, for three mornings, followed by a dose of castor oil. (See par 491.) The mechanical anthelmintics are strictly confined to those agents which kill the worm in the body by piercing its cuticle with the sharp darts or spiculae of the cowhage hairs, or the fine metallic points of powdered tin (pulvis stanni). When these drops are employed, they should be given in honey or treacle for ten or fifteen days, and an aperient powder every fourth morning, to expel the killed worms.