It was Dr. Grew who first extracted the salt from the Epsom water, and his treatise deals principally with that. He describes the effect of adding all sorts of chemicals, oil of vitriol, salt of tartar, nitre, galls, syrup of violets, and other substances to the solution; explains how it differs from the sal mirabilis (sulphate of soda); and writes of its delicate bitter taste as if he were commenting on a new wine. It most resembles the crystals of silver, he says, in the similitude of taste. As to the medicinal value of this salt Dr. Grew says it is free from the malignant quality of most cathartics, never violently agitates the humours, nor causes sickness, faintings, or pains in the bowels. He recommends it for digestive disorders, heartburn, loss of appetite, and colic; in hypochondriacal distemper, in stone, diabetes, jaundice, vertigo, and (to quote the English translation) “in wandering gout, vulgarly but erroneously called the rheumatism.” It will exterminate worms in children in doses of 1½ to 2 drachms, if given after 1, 2, or 3 grains of mercurius dulcis, according to age. Epsom salts were not to be given in dropsy, intermittent fevers, chlorosis, blood-spitting, to paralytics, or to women with child. “I generally prescribe,” writes the doctor, “one, two, or three pints of water, aromatised with a little mace, to which I add ½ oz. or 1 oz., or a greater dose of the salt.” He gives a specimen prescription which orders 1 oz. or 10 drachms of the salt in 2 quarts of spring water, with 1 drachm of mace. This dose (2 quarts, remember) was to be taken in the morning in the course of two hours, generally warm, and taking a little exercise meanwhile. This was what was called an apozem. You might add to the apozem, if thought desirable, 3 drachms of senna and 1½ oz. or 2 oz. of flaky manna. Mr. Francis Moult, Chymist, at the sign of the Glauber’s Head, Watling Street, London, translated Dr. Grew’s treatise into English, and gave a copy to buyers of the Bitter Purging Salts. Probably he was the “furnace philosopher” referred to by Quincy (see below), though it is difficult to see what there was to object to in his action.