. 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. ntly made, about 50 per cent, should be soluble in rectifiedspirit. It is occasionally employed in the form of ointment (Un-guentum Potassce Sulphurated, B. P.). On triturating 1 grm. of sulphurated potash with 1 grin, of crys-tallized copper sulphate and 10 cc. of water, and filtering, the fil-trate should remain unaffected by hydrogen sulphide, correspondingto at least per cent, of sulphu
. 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. ntly made, about 50 per cent, should be soluble in rectifiedspirit. It is occasionally employed in the form of ointment (Un-guentum Potassce Sulphurated, B. P.). On triturating 1 grm. of sulphurated potash with 1 grin, of crys-tallized copper sulphate and 10 cc. of water, and filtering, the fil-trate should remain unaffected by hydrogen sulphide, correspondingto at least per cent, of sulphur combined with potassium toform sulphide.— U. S. P. The extremely—indeed, most unusually—complicated nature ofthe decomposition will probably cause failure in any attempt by astudent to draw out an equation or a diagram of the reaction with-out the aid of the printed equation given above. He may thereforecontent himself in this case by introducing into his note-book adiagram founded directly on the equation and on the numbers ofmolecules there stated. With this printed equation, and the detailsof construction of diagrams given in connection with the first syn- Fig. 12. Fig. 13, Fig. Crucibles of Various Forms. thetical reaction, he will be able to give a diagram of this secondsynthetical reaction without unduly troubling his reasoning powers,while at the same time he will be familiarizing himself with themore mechanical portions of the diagram. In preparing large quantities of sulphurated potash the test-tube is replaced by an earthenware vessel termed a crucible 4* 70 THE METALLIC RADICALS. (possibly from crux, a cross, for originally a cross was impressedupon the melting-pot as used by alchemists and goldsmiths:others derive the word from crux, an instrument of torture, thesense here being symbolical). Heating Crucibles.—Crucibles of a few ounces capacity may beheated in an ordinary grate-fire. Larger ones require a stove witha good draught—that is, a furnace.
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