. 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. A Sublimate of White Arsenic (magnified). A Perfect Octahedron. an octahedron (dxrib, okto, eight; edpa, hedra, side) (Fig. 34a),or, rarely, a tetrahedron, and in a sublimate a few perfectoctahedra are generally present. Usually, however, the crystalsare modifications of octahedra, such as are shown in Fig. 34,which is drawn from actual sublimates. Second Analytical Reaction.—Place a thin piece o
. 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. A Sublimate of White Arsenic (magnified). A Perfect Octahedron. an octahedron (dxrib, okto, eight; edpa, hedra, side) (Fig. 34a),or, rarely, a tetrahedron, and in a sublimate a few perfectoctahedra are generally present. Usually, however, the crystalsare modifications of octahedra, such as are shown in Fig. 34,which is drawn from actual sublimates. Second Analytical Reaction.—Place a thin piece of copper,about a quarter inch wide and half inch long, in a solution ofwhite arsenic, acidified by hydrochloric acid, and boil (nitricacid must not be present, or the piece of metal will be dis-solved) ; arsenum is deposited on the copper in a metallic con-dition. (Memorandum.—An equivalent proportion of coppergoes into solution. The experiment forms an illustration of aclass of chemical changes appropriately termed changes bysubstitution.) Pour off the supernatant liquid from the copper,wash the latter with water, dry the piece of metal by holdingit in the clean fingers and passing throug
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