of it swims on the surface of cold water like a pale sulphureous film; but the greatest part sinks to the bottom, and remains there undissolved; the same is true of white arsenic. 4. This thrown on red hot iron, does not flame, but rises entirely in thick white fumes, which have the stench of garlick; and cover cold iron held just over them, with white flowers; white arsenic does the same. 5. I boiled ten grains of this powder in four ounces of clean water, and then, passing the decoction through a filtre, divided into five equal parts, which were put into as many glasses: Into one glass I poured a few drops of Spirit of Sal Ammoniac; into another some of the Lixivium of Tartar; into the third some strong Spirit of Vitriol; into the fourth some Spirit of Salt; and into the last some Syrup of Violets. The Spirit of Sal Ammoniac threw down a few particles of pale sediment. The Lixivium of Tartar gave a white cloud, which hung a little about the middle of the glass. The Spirits of Vitrol[*vitriol] and Salt made a considerable precipitation of a lightish coloured substance; which in the former, hardened into glittering chrystals, sticking to the sides and bottom of the glass. Syrup of Violets produced a beautiful pale green tincture. Having washed the saucepan, funnel, and glasses, used in the foregoing experiments, very clean, and provided a fresh filtre, I boiled ten grains of white arsenic bought of Mr. Wilcock, Druggist in Reading, in four ounces of clean water; and filtering it and dividing it into five equal parts, proceeded with them just as I had done with the former decoction. There was an exact similitude between the experiments made on the two decoctions. They corresponded so nicely on each trial, that I declare I never saw any two things in Nature more alike, than the decoction made with the powder found in Mr. Blandy's gruel, and that made with white arsenic. From the experiments, and others, which I am ready to produce, if desired, I believe that powder to be White Arsenic.
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