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absorbed absorption action Alps amount of heat angle aqueous vapour atmosphere atoms attraction augmented beam bismuth blue body carbonic acid cause chemical chemical affinity cleavage cloud colour dark diamagnetic direction distance earth effect electric emitted energy erosion ether experiments fact fall Faraday feet fissures flame force glacier glass Glen Roy Glen Spean gorge gravity green gun-cotton height Horseshoe Fall hydrogen inches invisible rays Joule lamp light liquid luminous magnet mass matter Mayer mechanical metal miles mind molecular molecules Morteratsch glacier motion mountains natural needle Niagara nitrite of amyl observed oxygen particles pass perfectly phenomena physical platinum polarisation pole Pontresina portion present prism produced proved quantity radiant heat radiation render river rock rocket Sir Thomas Dick-Lauder solar sound space spectrum substance surface temperature theory thick tion transparent tube ultra-red valleys velocity vibrations vis viva viva waves
Seite 415 - Voltaic electricity through electrolytes, and found, in all cases, that the heat evolved by the proper action of any Voltaic current is proportional to the square of the intensity of that current, multiplied by the resistance to conduction which it experiences. From this law he deduced a number of conclusions of the highest importance to electro-chemistry. It was during these enquiries, which are marked throughout by rare sagacity and originality, that the great idea of establishing quantitative...
Seite 412 - 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, and, in my intercourse with my fellow creatures, that which is religious and that which is philosophical have ever been two distinct things.
Seite 6 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Seite 74 - Indeed, the domain of the senses, in Nature, is almost infinitely small in comparison with the vast region accessible to thought which lies beyond them. From a few observations of a comet, when it comes within the range of his telescope, an astronomer can calculate its path in regions which no telescope can reach: and in like manner, by means of data furnished in the narrow world of the senses, we make ourselves at home in other and wider worlds, which are traversed by the intellect alone.
Seite 163 - Fresh pearls to their enamel gave, And the bellowing of the savage sea Greeted their safe escape to me. I wiped away the weeds and foam, I fetched my sea-born treasures home; But the poor, unsightly, noisome things Had left their beauty on the shore With the sun and the sand and the wild uproar.
Seite 48 - ... and striking proof of this identity. A concave mirror produces beyond the object which it reflects an inverted and magnified image of the object ; withdrawing, for example, our iodine solution, an intensely luminous inverted image of the carbon points of the electric light is formed at the focus of the mirror employed in the foregoing experiments. When the solution is interposed and the light is cut away, what becomes of this image ? It disappears from sight, but an invisible thermograph remains,...
Seite 179 - An eminent friend of mine often speaks of the mistake of those physicians who regard man's ailments as purely chemical, to be met by chemical remedies only. He contends for the psychological element of cure. By agreeable emotions, he says, nervous currents are liberated which stimulate blood, brain, and viscera. The influence rained from ladies' eyes enables my friend to thrive on dishes which would kill him if eaten alone.
Seite 375 - ... animal heat. Thus, strictly speaking, the process of building a vegetable is one of winding up ; the process of building an animal is one of running down. The warmth of our bodies, and every mechanical energy which we exert, trace their lineage directly to the sun. The fight of a pair of pugilists, the motion of an army, or the lifting of his own body up mountain slopes by an Alpine climber, are all cases of mechanical energy drawn from the sun.
Seite 307 - The finer the slate is the more perfect will be the resemblance of its cleavage to that of the wax. Compare the surface of the wax with the surface of this slate from Borrodale in Cumberland. You have precisely the same features in both: you see flakes clinging to the surfaces of each, which have been partially torn away in cleaving. Let any observer compare these two effects, he will, I am persuaded, be led to the conclusion that they are the product of a common cause.
Seite 305 - Sedgwick proposed the theory that cleavage is due to the action of crystalline or polar forces subsequent to the consolidation of the rock. ' We may affirm,' he says, 'that no retreat of the parts, no contraction of dimensions in passing to a solid state, can explain such phenomena. They appear to me only resolvable on the supposition that crystalline or polar forces acted upon the whole mass simultaneously in one direction and with adequate force.