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Pagina 29 - An Essay on the application of Mathematical Analysis to the Theories of Electricity and Magnetism...
Pagina 32 - If the distance between the earth and the sun is 93 million miles, and if the mass of the sun is 300,000 times that of the earth, find two positions in which a particle would be equally attracted by the earth and the sun. The gravitational attraction of one body upon another varies inversely as the square of the distance and directly as the product of the masses. Represent the mass of the earth by unity.
Pagina 137 - Such millimeter divisions of the tube become degrees of osmose, which are of the same value in all instruments. Osmose in membrane presented many points of similarity to that in earthenware. The membrane is constantly undergoing decomposition and its osmotic action is exhaustible.
Pagina 26 - ... prove the incorrectness of Professor Challis's Theorem I. ; since in an orbit described by a body acted on by a force tending to a fixed centre, and varying, as Professor Challis supposes, as some function of the distance, the expression for the radius-vector in terms of the time cannot possibly contain any terms dependent on the sun's longitude. I now come to consider the reasoning by which Professor Challis arrives at his theorems. All this reasoning is based on his equation +--+ę*-* • •...
Pagina 139 - ... must therefore be confined to dead matter. But such apprehensions are, it is believed, groundless, or at all events premature. All parts of living structures are allowed to be in a state of incessant change, of decomposition and renewal. The decomposition occurring in a living membrane, while effecting osmotic propulsion, may possibly therefore be of a reparable kind. In other respects chemical osmose appears to be an agency particularly adapted to take part in the animal osconomy.
Pagina 195 - In the last edition of Professor Lehmann's Animal Chemistry, vol. ii. p. 363, a very decided opinion is expressed against the conclusion to which I arrived in consequence of some experiments published in the Philosophical Transactions for 1851. I considered it proved that ammonia was partly at least converted into nitrous acid in its passage through -the body. In opposition to this Professor Lehmann states, — 1st. That the method which I employed must of necessity give a reaction resembling that...
Pagina 207 - Brachiopoda to the auricles of Area, &c. (Trans. Zoological Society, vol. ip 159.) In 1843, however, M. Vogt's elaborate .memoir on Lingula appeared, in which the true complex structure of the ' heart ' in this genus was first explained and the plaited ' auricle ' discriminated from the ' ventricle'; and in 1845, Professor Owen, having apparently been thus led to re-examine the circulatory organs of Brachiopoda, published his ' Lettre sur 1'appareil de la Circulation chez les Mollusques de la Classe...
Pagina 37 - Analytique de la Chaleur, are of that simple elementary kind which constitute a mathematical theory properly so called; and therefore, when we find corresponding laws to be true for the phenomena presented by electrified bodies, we may make them the foundation of the mathematical theory of electricity...
Pagina 135 - This name was applied to the power by which liquids are impelled through moist membrane and other porous septa in experiments of endosmose and exosmose. It was shown that with a solution of salt on one side of the porous septum and pure water on the other side (the condition of the osmometer of Dutrochet when filled with a saline solution and immersed in water), the passage of the salt outward is entirely by diffusion, and that a thin membrane does not sensibly impede that molecular process. The...
Pagina 379 - In conclusion, then,' writes Professor Thomson, ' the source of energy from which solar heat is derived is undoubtedly meteoric. . . . , The principal source — perhaps the sole appreciable efficient source — is in bodies circulating round the sun at present inside the earth's orbit, and probably seen in the sunlight by us called