File:The London, Edinburgh and Dublin philosophical magazine and journal of science (1876) (14783906913).jpg

Identifier: londonedinburgh521876lond (find matches)
Title: The London, Edinburgh and Dublin philosophical magazine and journal of science
Year: 1840 (1840s)
Authors:
Subjects: Science
Publisher: London : Taylor & Francis
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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t-pellicle,owing perhaps to the multiplicity of points, at temperaturescertainly below 100° C, while the clear solution of the samesalt when saturated demands a temperature several degreesabove 100° C. for ebullition. The rise in temperature shownon mixing a dry colloid with water is probably connected withthe deficit below 100° C. of the temperature required to boilthe resulting colloid solution. Returning to the separation of ice from colloid solutions, wemust conceive that when ice so separates that the solutionbecomes enriched in regard to the colloid body, the particlesof ice in contact with the source of cold become overcooled(that is, fall below 0° C.) on account of the insufficient circula-tion and the imperfect thermal conductivity of ice and of thecolloid solution. But when such over-cooled ice is stirredwith the colloid solution a fresh portion of ice is formed ifthe latter is already at 0° C. ; if above 0° C, then some of the 224 On Salt Solutions and Attached Water.
Text Appearing After Image:
Notices respecting New Books. 225 ice melts : in either case the 0° C. is restored. Ultimatelythe solid particles of the anhydrous colloid must lie side byside with the ice particles, as they do when the two are mixedas powders, as in § 162. They are as independent of oneanother as are the particles of ether and chloroform when thetwo are mixed, or as are the particles of two gases whichdiffuse through one another without combination. I reserve the results which I have obtained with inorganiccolloids for a future communication. . The figure shows the same constants as were shown in thefigure, Paper IV., but with the new salts. XXIX. Notices respecting New Books.The Moon, and the Condition and Configurations of its Surface. By Edmuxd Neiso^, F.B.A.S. 4c. London: Longmans, Green, & Co.TV/TANY distinct branches of observational astronomy have been■*••*- cultivated of late years, some to a much greater extent thanothers; that which has received the smallest amount of attention

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