Cathartics are divided into laxatives and purgatives. Manna,
tamarinds, castor oil, sulphur, and magnesia are _laxatives;_ senna,
rhubarb, jalap, colocynth, buckthorn, aloes, cream of tartar,
scammony, calomel, Epsom salts, Glauber's salts, sulphate of potash,
and Venice turpentine are _purgatives._