. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. narrower part of the tube until theair in the tube has reoxidized it to arsenous anhydride. If the operation has been performed in a less delicate mannerin an ordinary test-tube, cut or break off portions of the tubecontaining the sublimate of arsenum, put them into a test-tube and heat the botom of the latter, holding it near horizon-tally, and partially covering the mouth with the finger or 172
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. narrower part of the tube until theair in the tube has reoxidized it to arsenous anhydride. If the operation has been performed in a less delicate mannerin an ordinary test-tube, cut or break off portions of the tubecontaining the sublimate of arsenum, put them into a test-tube and heat the botom of the latter, holding it near horizon-tally, and partially covering the mouth with the finger or 172 THE METALLIC RADICALS. thumb : the arsenum will absorb oxygen from the air in thetube, and the resulting arsenous anhydride (As203) be depos-ited on the cool part of the tube in brilliant, generally im-perfect, octahedral crystals. Microscopic Test.—Prove that the crystals are identical inform with those of common white arsenic by heating a grainor less of the latter in another test-tube, examining the twosublimates by a good lens or compound microscope. The appearance of a sublimate of white nrsenic is peculiarand quite characteristic. The primary form of each crystal is Fig. 34. Fig,
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