On poisons in relation to medical jurisprudence and medicine . mpared — Evidence fromsmall quantities of arsenic. ARSENIC—CHEMICAL ANALYSIS. Arsenic as a Solid.—In the simple state, white arsenic may be iden-tified by the following properties: 1. A small quantity of the powder,placed on platinum-foil, is entirely vola- FlG 15 tilized at and below a heat of 370° in awhite vapor. Should there be any residue,it is impurity. Sometimes plaster of Parisor chalk is found mixed with it. If a smallportion of the white powder is gently heatedin a glass tube of narrow bore, it will besublimed and form a
On poisons in relation to medical jurisprudence and medicine . mpared — Evidence fromsmall quantities of arsenic. ARSENIC—CHEMICAL ANALYSIS. Arsenic as a Solid.—In the simple state, white arsenic may be iden-tified by the following properties: 1. A small quantity of the powder,placed on platinum-foil, is entirely vola- FlG 15 tilized at and below a heat of 370° in awhite vapor. Should there be any residue,it is impurity. Sometimes plaster of Parisor chalk is found mixed with it. If a smallportion of the white powder is gently heatedin a glass tube of narrow bore, it will besublimed and form a ring of minute octa-hedral crystals, remarkable for their lustreand brilliancy. (See Fig. 15, also Fig. 17, ) Under a microscope of good magni-fying power (250 diameters), the appearanceof these crystals is remarkably beautiful and Crystals of arse»i0»s acid *?subli- 1 . ,. -/. , . „~^ , mation, mastmiied 30 diameters. characteristic; one not exceeding the 4000th of an inch in size may be easily recognized by the aid of this instrument. 20. 306 TESTS FOR AESENIC AS A SOLID.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectpoisons, bookyear1875
