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- W4248914597 abstract "Poggendorff's Annalen der Physik tmd Chemie, No. 10, 1872.—This number commences with a paper by Dr. Herwig on the expansion relations of superheated vapours. In his experiments he used a U-tube, one limb of which contained the vapour and the other dry air, these being separated by a little mercury, and the instrument being heated in a bath. The general result arrived at is that, at certain low pressures, with constant volume, superheated vapour has a smaller coefficient of expansion than that of perfect gases (viz. 0003663). The numerical results for sulphide of carbon, chloroform, and alcohol, are tabulated.—J. Baranetzky communicates a long and interesting paper of researches in diosmosis.* Sketching the history of the subject, he points out several defects in previous investigations. Nearly all the experimenters from Vierodt's time have sought to determine the endosmotic equivalents of salts, and the results are very discordant. The diosmotic properties of colloids have been imperfectly studied and misconceived. The membranes employed have mostly been animal, and the influence of the nature of the membrane is a question which, M. Baranetsky thinks, hashaidly been touched. Having directed his experiments to some of these points, he shows the influence of various kinds of membrane (parchment, bladder, artificial cellulose, pyroxilin), and various thicknesses of membrane on the endosmose of various salts. As to the colloids, he found that, when of moderate concentration (say 10 p. c.) and freed from mineral substances, they showed little or no endosmose; and for the same degree of concentration, pyroxilin and cellulose gave more endosmose than animal membranes. The writer further discusses the influence of adhesion, and concludes by applying his observations to animal and plant life.—G. Vom Rath gives his concluding mineralogical paper, treating chiefly of the chemical composition of some Vesuvian products; and this is followed by an account of some studies in micro-mineralogy (last of a series also) by Dr. V. Lasaulx.— In a note by H. F. Weber, on the specific heat of carbon, the discrepancy of various observations is attributed to the fact that the specific heat (in this case) varies with the temperature, being tripled, in the case of the diamond, between 0° and 200°." @default.
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- W4248914597 date "1872-12-01" @default.
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- W4248914597 title "Scientific Serials" @default.
- W4248914597 doi "https://doi.org/10.1038/007153a0" @default.
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