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 moderate temperature for a month. After straining, the liquid was evaporated to 10 oz., and 4-1/2 oz of alcohol were added.

Rousseau was a Capucin monk and was destined for mission work in Asia. Sent from Rome to Paris to study medicine so that he might be better fitted for his life's work, he carried a letter of introduction to Colbert, the first minister of Louis XIV. Rooms were provided for him in the Louvre, and there before long he set up a laboratory and began to prepare and sell medicines. The Capucin of the Louvre became the fashionable quack, and Louis ordered the Faculty of Medicine to confer on him a degree. The life was so agreeable that, when orders came from Rome that he was to proceed on his mission, Rousseau refused, and, having transferred his allegiance to the order of Cluny, he continued his medical practice in Paris. Falling ill he refused medical aid, treated himself with his own compounds, and died. After his death his brother published his "Remédes et Secréts Eprouvés" (1697).

Black Drop was the name of a celebrated proprietary medicine very popular from the first half of the eighteenth, until the early part of the nineteenth century. Its inventor was one Edward Runstall of Bishop Auckland in the county of Durham, but it also came to be known as the Lancaster or the Quaker's Black Drop. A formula for it was found by a Dr. Armstrong among the papers of a relative of the proprietor, and was published in a treatise on fevers in the early part of the nineteenth century. The recipe was as follows:—Opium, 1/2 lb.; good verjuice (the juice of the wild crab), 4 pints; nutmegs, 1-1/2 oz.; saffron, 1/2 oz. Boil to a proper consistence, set in a warm place, add two spoonfuls of yeast, set in a warm place for six or eight weeks, then in the open air until