Croonian Lectures on Matter & Force ...

Churchill, 1868 - 223 pàgines

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Pàgina 22 - To the main objection of Dr. Young that all bodies would have the properties of solar phosphorus if light consisted in the undulations of ordinary matter, it may be answered that so many bodies have this property, and with so great variety in its duration, that non constat all may not have it, though for a time so short that the eye cannot detect its duration...
Pàgina 26 - It is hardly necessary to add, that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance ; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner the Heat was excited and communicated in these experiments, except it be MOTION.
Pàgina 133 - All that such an animal can do is to liberate that store of force, or potential energy, which is locked up in its food. It is the chemical change which food suffers in the body of an animal that liberates the previously pent-up...
Pàgina 141 - This standard of force is termed a metrekilogram ;* and 425 metrekilograms are equal to that amount of heat which is necessary to raise the temperature of 1 kilogram of water through 1° C. If then it be found that the heat evolved by the combustion of a certain weight of charcoal or muscle, for instance, raises the temperature of 1 kilogram of water through 1° C., this means, when translated into mechanical power, 425 metrekilograms.
Pàgina 141 - First, the amount of force or energy generated by the oxidation of a given amount of muscle in the body ; secondly, the amount of mechanical force exercised by the muscles of the body during a given time ; thirdly, the quantity of muscle oxidized in the body during the same time.
Pàgina 1 - There is no philosophy in my religion. I am of a very small and despised sect of Christians, known, if known at all, as Sandemanians, and our hope is founded on the faith that is in Christ. But though the natural works of God can never by any possibility come in contradiction with the higher things that belong to our future existence, and must with everything concerning Him ever glorify Him, still I do not think it at all necessary to tie the study of the natural sciences and religion together...
Pàgina 17 - A particle of oxygen," wrote Faraday, " is ever a particle of oxygen ; nothing can in the least wear it. If it enters into combination and disappears as oxygen, if it pass through a thousand combinations, animal, vegetable, mineral, — if it lie hid for a thousand years and then be evolved, it is oxygen with its first qualities neither more nor less.
Pàgina 169 - ... is in part transmuted into muscular force. The combustible food and oxygen coexist in the blood which courses through the muscle ; but when the muscle is at rest, there is no chemical action between them. A command is sent from the brain to the muscle, the nervous agent determines oxidation.
Pàgina 34 - I shall lose no time in repeating and extending these experiments, being satisfied that the grand agents of nature are, by the Creator's fiat, indestructible ; and that wherever mechanical force is expended, an exact equivalent of heat is always obtained.
Pàgina 196 - ... in one hour the lithium may be very evident in the outer part of the lens, and very faintly in the inner part ; but if the stomach be full of food, the lithium does not in an hour reach the lens. Even in two hours and a half the lithium may be more marked in the outer than in the inner part of the lens. In four hours the lithium will be in every part of the lens, but it will still be more evident in the humours than in the lens. Even in eight hours the centre of the lens may show less than the...

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