. The London, Edinburgh and Dublin philosophical magazine and journal of science. e above 6C, although the lessdense substance does not acquire the property of dissolving-iodine. Hagenbach (5) found that the resistance of a verydilute solution of sodium iodide or bromide in sulphurdioxide remained less in the upper portion of the tube than 3 G2 796 Mr. F. B. Young on the in the lower for two or three hours after the temperaturehad been raised above the Cagniard-Latour (6) observed similar effects in ammonia and S02,whilst the dielectric constant for H2S differed also in s
. The London, Edinburgh and Dublin philosophical magazine and journal of science. e above 6C, although the lessdense substance does not acquire the property of dissolving-iodine. Hagenbach (5) found that the resistance of a verydilute solution of sodium iodide or bromide in sulphurdioxide remained less in the upper portion of the tube than 3 G2 796 Mr. F. B. Young on the in the lower for two or three hours after the temperaturehad been raised above the Cagniard-Latour (6) observed similar effects in ammonia and S02,whilst the dielectric constant for H2S differed also in similarfashion. If, however, the density differences can be explainedin accordance with Andrewss theory these latter forms ofevidence become inconclusive. For though, by definition,the liquid and vapour cease to exist above the Cagniard-Latour temperature, there is no cogent reason why theirpeculiar properties should forthwith disappear. The diagramof Andrews is apt to give an impression of discontinuity at6C which in practice is nonexistent. The ordinate AB (fig. 1), Fig. 1. I. V for which v is equal to the critical volume Vc, appears inmeeting the saturation curve to strike a point of suddentransition ; this is because of the impossibility of realizingthe theoretical isothermals within that curve. In practice,however, as the explanations of both Gouy and Villardindicate, the bulk of the substance does not, during rise oftemperature, pass through 0C along the isothermal AB, but,roughly speaking, along two ordinates DC and EF, forwhich v Vc respectively. In this case the dis-continuity at 6C ceases to be apparent. Hence it is notunreasonable to assume that the continued difference ofdensity will be accompanied by a continued difference ofproperties; and if adequate causes for the observed persistencyof the density difference can be found which are in accord-ance with Andrewss theory, the same causes may be heldto produce indirectly the observed differences of electricaland chemi
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