Fifty Years of Science: Being the Address Delivered at York to the British Association August 1881

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Macmillan, 1882 - Science - 90 pages
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Page 87 - The ancients had no conception of progress ; they did not so much as reject the idea ; they did not even entertain the idea. Oriental nations are just the same now.
Page 50 - ... is raised or lowered as it approaches or recedes from us. Everyone has observed that if a train whistles as it passes us, the sound appears to alter at the moment the engine goes by. This arises, of course, not from any change in the whistle itself, but because the number of vibrations which reach the ear in a given time are increased by the speed of the train as it approaches, and diminished as it recedes. So, like the sound, the color would be affected by such a movement ; but Doppler's method...
Page 54 - The floor of heaven is not only "thick inlaid with patines of bright gold," but is studded also with extinct stars, once probably as brilliant as our own sun, but now dead and cold, as Helmholtz tells us our sun itself will be some seventeen millions of years hence.
Page 59 - The whole sky from the zenith to the horizon becomes one molten mantling sea of colour and fire ; every black bar turns into massy gold ; every ripple and wave into unsullied shadowless crimson and purple and scarlet, and colours for which there are no words in language and no ideas in the mind — things which can only be conceived while they are visible...
Page 75 - Avogadro (1811), that equal volumes of gases under the same conditions of temperature and pressure contain equal numbers of molecules...
Page 87 - SUMMARY. 89 and above the accumulation of facts), the theory of evolution, the antiquity of man, and the far greater antiquity of the world itself ; the correlation of physical forces and the conservation of energy ; spectrum analysis and its application to celestial physics ; the higher algebra and the modern geometry ; lastly, the innumerable applications of science to practical life...
Page 90 - Review. AMERICAN ADDRESSES : with a Lecture on the Study of Biology. 8vo. 6s. 6d.
Page 3 - I long shrank from the attempt to give even a panoramic survey of a subject so vast and so difficult ; nor should I have ventured to make any such attempt, but that I knew I could rely on the assistance of friends in every department of science. Certainly, however, this is an opportunity on which it may be well for us to consider what have been the principal scientific results of the last half- century, dwelling especially on those with which this Association is more directly concerned, either as...
Page 8 - ... number of new views he has opened up, and the additional interest which he has aroused in, and contributed to, Biology. When we were young we knew that the leopard had spots, the tiger was striped, and the lion tawny ; but why this was so it did not occur to us to ask ; and if we had asked no one would have answered. Now we see at a glance that the stripes of the tiger have reference to its life among jungle-grasses ; the lion is sandy, like the desert ; while the markings of the leopard resemble...
Page 15 - The general result is that to insects, and especially to bees, we owe the beauty of our gardens, the sweetness of our fields. To their beneficent though unconscious action flowers owe their scent and color, their honey — nay, in many cases, even their form.

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