Philosophical Magazine (Google eBook)

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Taylor & Francis., 1848 - Physics
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Page 317 - In the present state of science no operation is known by which heat can be absorbed, without either elevating the temperature of matter, or becoming latent and producing some alteration in the physical condition of the body into which it is absorbed; and the conversion of heat (or caloric) into mechanical effect is probably impossible, certainly undiscovered.
Page 473 - They are inscriptions in an unknown hieroglyphic, which we are quite sure mean something, but of which we have scarcely begun to master the alphabet. There appear however reasonable grounds for believing that the Creator has assigned to each class of animals a definite type, or structure, from which he has never departed, even in the most exceptional or eccentric modifications of form.
Page 149 - Lyell's views) can well be supposed to have been. In the slow secular variations of our supply of light and heat from the sun, which in the immensity of time past may have gone to any extent, and succeeded each other in any order without violating the analogy of sidereal phenomena which we know to have taken place, we have a cause, not indeed established as a fact, but readily admissible as something beyond a bare possibility, fully adequate to the utmost requirements of geology. A change of half...
Page 354 - ... 0. By the term continuous function, I here understand a function whose value does not alter per saltum, and not (as the term is sometimes used) a function which preserves the same algebraical expression. Indeed, it seems to me to be of the utmost importance, in considering the application of partial differential equations to physical, and even to geometrical problems, to contemplate functions apart from all idea of algebraical expression.
Page 150 - I and c, pl. 2 fig. 14, which attract each other in the inverse ratio of the squares of the distances, and in the direct ratio of their masses, being projected from the points i and c, according to the directions IB and CG, with given velocities, to find the curves which they would describe.
Page 141 - Concentrated sulphuric acid dissolves it with a yellow colour, and water precipitates it again in yellow flocks. On heating the solution in sulphuric acid it becomes darker, but no. gas is given off; some decomposition seems however to have taken place in consequence of the heating, for water now produces no precipitate. Concentrated nitric acid dissolves it on boiling, and slowly decomposes it with an evolution of nitrous acid. It dissolves in a solution of perchloride of iron with a dark reddish-brown...
Page 238 - Crucis that the galactic circle, or medial line of the Milky Way, may be considered as crossed by that of the zone of large stars which is marked out by the brilliant constellation of Orion, the bright stars of Canis Major and almost all the more conspicuous stars of Argo, the Cross, the Centaur, Lupus and Scorpio. A great circle passing through Orionis and a.
Page 133 - ... colouring matters. I shall therefore, without any further preface, state the new results which I have arrived at in regard to the chemical constituents of this root. On treating finely-ground madder roots with boiling water, a brown fluid is obtained having a taste between bitter and sweet. In order to extract all the substances capable of solution in water, about sixteen quarts of water are required for every pound of madder. To this fluid any strong acid, such as sulphuric or muriatic acid,...
Page 140 - ... account with the results obtained by myself, I have come to the conclusion that the substance to which I have applied the name of alizarin is identical with his. Alizarin has the following properties : When heated on platinum foil it melts and burns with a bright flame. When heated in a glass tube closed at one end it melts and gives yellow fumes, which condense on the colder parts of the glass, forming an oil, which soon congeals to a mass of orange-coloured crystals possessing a considerable...
Page 63 - European bees'-wax examined by the author ; but suspecting that its quantity might vary in other instances, he procured bees'-wax from Ceylon, formed under different conditions of climate and vegetation, and found on examination that there was a total absence of the acid in that specimen. The author draws attention to this curious variation in the nature of an animal secretion under different conditions of life, a variation of which we have another example in that of the volatile acid of butter,...

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