. Journal . (more than so cm. long)dipping into the mercury trough, the temperature of thereceiver is allowed to rise slowly, and the evolved gas iscollected in appropriate vessels. The following details aregiven:—Carbon dioxide: Prepared from marble and hydro-chloric acid, washed in alkali bicarbonate solution, andpassed over solid bicarbonate; purifiers at — 70C. inacetone and liquid carbon dioxide, receivers at — 182 C. inliquid oxygen. Hydriodic and: Prepared in the usualway ; purifiers at -32° C. and receivers at - 60° C. Hydro-chloric acid: From sodium chloride aad sulphuric acid;purifie
. Journal . (more than so cm. long)dipping into the mercury trough, the temperature of thereceiver is allowed to rise slowly, and the evolved gas iscollected in appropriate vessels. The following details aregiven:—Carbon dioxide: Prepared from marble and hydro-chloric acid, washed in alkali bicarbonate solution, andpassed over solid bicarbonate; purifiers at — 70C. inacetone and liquid carbon dioxide, receivers at — 182 C. inliquid oxygen. Hydriodic and: Prepared in the usualway ; purifiers at -32° C. and receivers at - 60° C. Hydro-chloric acid: From sodium chloride aad sulphuric acid;purifiers at — 80° C., receivers at—150° C. Phosphine ■Prepared by any ordinary process ; purifiers at —80° C-,receivers at — 182D C. The evolved sra9 is not spontaneouslyinflammable. Hydrogen sulphide : From ferrous sulphideaud sulphuric acid; purifiers at — 70C, receivers at— 100 ■The hydrogen simultaneously produced passes out bv thepump. Nitrogen dioxide : From nitric acid and copper;. ] Virion Dioxide from Sodium Carbonate Solutions; Libera-tion of . F. W. Kiister. Zeits. f. Elektrochem., 1903, 9, [34], 679—682. (See also this Journal, 1S03,417.) Stikuing the experiments on the evolution of carbonloxide from solutions of sodium carbonate, containingtrying amounts of caustic soda, the author finds that theve connecting the amount of carbon dioxide evolved,the percentage of sodium carbonate in the solution,even, with no bends, and not the slightest irregularity at: point where the composition of the solution correspondsthat of trona (XajCO^ + 2XaHC03). Precisely similar•Its were obtained with solutions of sodium bicarbonate,90° C. The curve connecting the conductivities of mixtures ofnal solutions of sodium bicarbonate, carbonate, anddroxide at 25° C, with their percentage composition,I likewise continuous and even.—L. F. G. Iurc, Gases; Apparatus for Preparation of . H. Moissan. Comptes rend., 1903, 137, [6], 363— principle of the method
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