Humboldt library of science. no. 7, 1880, Tema 7Humboldt Publishing Company, 1880 |
Términos y frases comunes
absorbed heat action actual motion amount animal atoms attraction battery body carbonic acid cause chemical affinity chemical separation Cloth coal conductor conservation of energy converted decompose delicacy difference direction Double Number earth Edward Clodd electrical separation energy of position equal Essays fact force of cohesion friction galvanometer glass Grant Allen gravity head of water Herbert Spencer Huxley illustrations instance J. F. C. Hecker Joule kilogramme kind let us suppose machine magnet mass matter means ment mental metres mind molecular molecules momentum moving nature oxidation oxygen particles pendulum physical piston plane poles positive electricity principle produced Prof quantity radiant energy rays Richard Chenevix Trench rifle ball right-hand coil rubbed Science species of motion spent substance sun's T. H. Huxley theory thing tion transmutation of energy truth ultimately units universe upward velocity visible energy visible motion weight William Kingdon Clifford wire zinc
Pasajes populares
Página 415 - From the ingress of a sensation, to the outgoing responses in action, the mental succession is not for an instant dissevered from a physical succession.
Página 373 - But a simple elementary atom is truly an immortal being, and enjoys the privilege of remaining unaltered and essentially unaffected amid the most powerful blows that can be dealt against it— it is probably in a state of ceaseless activity and change of form, but it is nevertheless always the same. 11. Now, a little reflection...
Página 414 - Nature : one mechanical, or molar, the momentum of moving matter ; the others molecular, or embodied in the molecules, also supposed in motion — these are, heat, light, chemical force, electricity. To these powers, which are unquestionable and distinct, it is usual to add vital force, of which, however, it...
Página 415 - It would be incompatible with everything we know of the cerebral action, to suppose that the physical chain ends abruptly in a physical void, occupied by an immaterial substance ; which immaterial substance, after working alone, imparts its results to the otner edge of the physical break, and determines the active response — two shores of the material with an intervening ocean of the immaterial.
Página 420 - Any thing like a great or general cultivation of the powers of thought, or any occupation that severely and continuously brings them into play, will induce such a preponderance of cerebral activity, in oxidation and in nerve-currents, as to disturb the balance of life, and to require special arrangements for redeeming that disturbance. This is fully verified by all we know of the tendency of intellectual application to exhaust the physical powers, and to bring on early decay.
Página 420 - ... intensity of nervous action, and conflicting currents, both being sources of waste. The sleeplessness of the pained condition means that the circulation is never allowed to subside from the brain ; the irritation maintains energetic currents, which bring the blood copiously to the parts affected. There is a possibility of excitement, of considerable amount, without either pleasure or pain ; the cost here is simply as the excitement : mere surprises may be of this nature. Such excitement has no...