The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science

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Taylor & Francis, 1864
 

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Stran 472 - Seeing therefore the variety of Motion which we find in the World is always decreasing, there is a necessity of conserving and recruiting it by active Principles, such as are the cause of Gravity, by which Planets and Comets keep their Motions in their Orbs, and Bodies acquire great Motion in falling; and the cause of Fermentation...
Stran 248 - Practical Instruction in Mineralogy and Geology.- He can also supply Elementary Collections of Minerals, Rocks, and Fossils, on the following terms: — 100 Small Specimens, in cabinet, with three trays...
Stran 555 - ... could be rendered sufficiently intense. The effect in principle is the same, whether we consider the platinum wire to be struck by a particle of aqueous vapour oscillating at a certain rate or by a particle of ether oscillating at the same rate. By plunging a platinum wire into a hydrogen flame we cause it to glow, and thus introduce shorter periods into the radiation. These, as already stated, are in discord with...
Stran 124 - The sole cause of the phenomena of the glacial epoch was a higher temperature of the ocean than that which obtains at present.
Stran 158 - ... in it are arranged in groups, radiating from one or more points on the external surface, in such a manner as to indicate that they were developed after the fragments had acquired their present spheroidal shape (Aussun, &c.).
Stran 158 - This sometimes gives rise to a structure remarkably like that of consolidated volcanic ashes, so much, indeed, that I have specimens which, at first sight, might readily be mistaken for sections of meteorites. It would therefore appear that, after the material of the meteorites was melted, a considerable portion was broken up into small fragments, subsequently collected together, and more or less consolidated by mechanical and chemical actions, amongst which must be classed a segregation of iron,...
Stran 248 - Ludlow, Devonian, and Carboniferous Rocks. SECONDARY FOSSILS, from the Trias, Lias, Oolite, Wealden, and Cretaceous Groups. TERTIARY FOSSILS, from the Woolwich, Barton, and Bracklesham Beds, London Clay, Crag, &c. In the more expensive Collections some of the Specimens are rare, and all more select.
Stran 38 - The living animal con-, sumes combustible substances belonging to the vegetable world, and causes them to reunite with the oxygen of the atmosphere. Parallel to this process runs the work done by animals. This work is the end and aim of animal existence.
Stran 39 - In reality, however, besides the production of mechanical effects, there is in the animal body a continuous generation of heat. The chemical force contained in the food and inspired oxygen is therefore the source of two other forms of power, namely, mechanical motion and heat ; and the sum of these physical forces produced by an animal is the equivalent of the contemporaneous chemical process. Let the quantity of mechanical work performed by an animal in a given time be collected and converted by...
Stran 130 - When the excentricity is at a maximum, the distance of the sun from the earth, when the latter is in the aphelion of its orbit, is no less than 102,256,873 miles; and when in the perihelion it is only 87,503,039 miles.

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