The elements of materia medica and therapeutics . phragm, and then suddenly removmg the pres-sure. Dash cold water over the body, and abstract a small quantityof blood either by venesection or cupping. Apply bottles of hotwater to the feet. Stimulants of various kinds may be employed,either internally by the stomach, or in the form of frictions, or inhala-tions of ammonia, or air impregnated with chlorine gas. On the Efficacy of Carbonic Acid Gas in the Diseases of Tropical Climates ; with Directions forthe Treatment of Acute and Chronic Stages of Dysentery. Reviewed in the London Medical Gaze
The elements of materia medica and therapeutics . phragm, and then suddenly removmg the pres-sure. Dash cold water over the body, and abstract a small quantityof blood either by venesection or cupping. Apply bottles of hotwater to the feet. Stimulants of various kinds may be employed,either internally by the stomach, or in the form of frictions, or inhala-tions of ammonia, or air impregnated with chlorine gas. On the Efficacy of Carbonic Acid Gas in the Diseases of Tropical Climates ; with Directions forthe Treatment of Acute and Chronic Stages of Dysentery. Reviewed in the London Medical Gazette,vol. xviii. p. 777. 1836. CARBONIC ACID WATER. 339 AQUA ACIDI CARBONICI; Carbonic Acid Water; Bottle Soda Water;Soda Water from the Fountain; Artificial Seltzer Water.—This isprepared by condensing carbonic acid gas (generated by the action ofsulphuric acid on whiting) in water. The operation is effected bymeans of Tylers Improved Soda-Water Apparatus (figs. 57 & 58) \ ^*^ £.S^fe-ij QJ-riCL h O-M CCrt „^ I ^ |l«-1l||si.|s.§tg|.|^|. SIS? ca-Cis s^ ~S • =? -i^ S 2 fe-s.£;S5gS,gSg^53«aS§«.§S22°o?«^sc^fl-2S o „ hr:J o) 3 s ^ _3 P.* S =«^ ?^ ^«55^ SUi3 5 53 = |al S&l 2 These figures are taken from Ures Diet, of Arts and Manufactures, p. 1156. London, 1839. 340 ELEMENTS OF MATERIA MEDICA. At the ordinary temperature and pressure of the atmosphere, onevolume of water absorbs one volume of carbonic acid gas, and ac-quires a sp. gr. of r0018. By doubling the pressure, the quantity ofgas absorbed by the water is doubled, and so on for other degrees ofpressure ; for Dr. Henry has shown, that the quantity of gas forcedinto the water is directly as the pressure. In the United States Phar-macopoeia five volumes of gas are directed to be condensed in onevolume of Avater. The Bottle Soda Water of the shops is, in general, carbonic acidwater only. Some few manufacturers introduce a small portion ofsoda (see Aqua Soda Supercarbonatis). Carbonic acid water is a brisk, spar
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