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[TO-DAY, ENJOYS HIS HALLS, BUILT TO HIS MIND.] 726. Chalk Chalk, when prepared by washing, becomes an astringent as well as antacid. It is used internally in diarrhoea, in the form of mixture, and externally as an application to burns, scalds, and excoriations. Dose of the mixture, from one to two ounces. 727. White Vitriol White Vitriol, or Sulphate of Zinc, is an astringent, tonic, and emetic. It is used externally as a collyrium for ophthalmia (See DOMESTIC PHARMACOPEIA, par. 475 et seq.), and as a detergent for scrofulous ulcers, in the proportion of three grains of the salt to one ounce of water. It is used internally in indigestion, and many other diseases; but it should not be given unless ordered by a medical man, as it is a poison. 728. Local Stimulants. Local stimulants comprise emetics, cathartics, diuretics, diaphoretics, expectorants, sialogogues, errhines, and epispastics. 729. Emetics. Emetics are medicines given for the purpose of causing vomiting, as in cases of poisoning. They consist of ipecacuanha, camomile, antimony, copper, zinc, and several others. 730. Ipecacuanha Ipecacuanha is an emetic, diaphoretic, and expectorant. It is used internally to excite vomiting, in doses of from ten to twenty grains of the powder, or one to one and a half ounce of the infusion, every half hour until vomiting takes place. To make it act well and easily, the patient should drink half pints of warm water after each dose of the infusion. As a diaphoretic, it should be given in doses of three grains, mixed with some soft substance, such as crumbs of bread, and repeated every four hours.