Annual of Scientific Discovery: Or, Year-book of Facts in Science and Art, for [1850]-71, Exhibiting the Most Important Discoveries and Improvements in Mechanics, Useful Arts, Natural Philosophy, Chemistry, Astronomy, Geology, Biology, Botany, Mineralogy, Meteorology, Geography, Antiquities, Etc., Together with Notes on the Progress of Science ... a List of Recent Scientific Publications; Obituaries of Eminent Scientific Men, Etc. ...Gould and Lincoln, 1867 |
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The Annual of Scientific Discovery, Or Year-Book of Facts in Science and Art ... David A. Wells Previsualització no disponible - 2018 |
The Annual of Scientific Discovery, Or Year-Book of Facts in Science and Art ... David A. Wells Previsualització no disponible - 2016 |
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Passatges populars
Pàgina 168 - It is conceivable that the various kinds of matter, now recognized as different elementary substances, may possess one and the same ultimate or atomic molecule existing in different conditions of movement. The essential unity of matter is an hypothesis in harmony with the equal action of gravity upon all bodies. We know the anxiety with which this point was investigated by Newton, and the care he took to ascertain that every kind of substance, ' metals, stones, woods, grain, salts, animal substances,'...
Pàgina 75 - The natural philosopher of to-day may dwell amid conceptions which beggar those of Milton. So great and grand are they, that, in the contemplation of them, a certain force of character is requisite to preserve us from bewilderment.
Pàgina 75 - The law of conservation rigidly excludes both creation and annihilation. Waves may change to ripples and ripples to waves, — magnitude may be substituted for number, and number for magnitude, — asteroids may aggregate to suns, suns may resolve themselves into florae and faunae, and florae and faunae melt in air, — the flux of power is eternally the same. It rolls in music through the ages, and all terrestrial energy, — the manifestations of life as well as the display of phenomena, are but...
Pàgina 165 - I have spoken of it, are similar to those of the law of molecular diffusion ; but it is important to observe that the phenomena of effusion and diffusion are distinct and essentially different in their nature. The effusion movement affects masses of gas, the diffusion movement affects molecules ; and a gas is usually carried by the former kind of impulse with a velocity many thousand times greater than by the latter.
Pàgina 214 - Maudit, the snow suddenly gave way beneath our feet, beginning at the head of the line, and carried us all down the slope to our left. I was thrown instantly off my feet, but was still on my knees and endeavouring to regain my footing, when, in a few seconds, the snow on our right, which was of course above us, rushed into the gap thus suddenly made, and completed the catastrophe by burying...
Pàgina 262 - It is, simply, at every syllable pronounced, to tap at the same time with the finger; by so doing, 'the most inveterate stammerer will be surprised to find that he can pronounce quite fluently, and, by long and constant practice, he...
Pàgina 248 - The student of Nature wonders the more and is astonished the less, the more conversant he becomes with her operations ; but of all the perennial miracles she offers to his inspection, perhaps the most worthy of admiration is the development of a plant or of an animal from its embryo. Examine the recently laid egg of some common animal, such as a salamander or a newt. It is a minute spheroid in which the best microscope will reveal nothing but a structureless sac, enclosing a glairy fluid, holding...
Pàgina 136 - The atom of aqueous vapour will therefore radiate with 16,000 times the energy of an atom of air. Imagine then this powerful radiant in the presence of space, and with no screen above it to check its radiation. Into space it pours its heat, chills itself, condenses, and the tropical torrents are the consequence. The expansion of the air, no doubt, also refrigerates it ; but in accounting for those deluges, the chilling of the vapour by its own radiation must play a most important part.
Pàgina 312 - The sympathy, also, which appears to exist between forces operating in the sun, and magnetic* forces belonging to the earth merits a continuance of that close attention which it has already received from the British Association, and of labours such as General Sabine has with so much ability and effect devoted to the elucidation of the subject. I may here notice that most remarkable phenomenon which was seen by independent observers at two different places on the 1st of September, 1859.
Pàgina 76 - The mechanical force of every river in the world as it rolls towards the ocean, is drawn from the heat of the sun. No streamlet glides to a lower level without having been first lifted to the elevation from which it springs by the mighty power of the sun. The energy of winds is also due entirely to the sun ; but there is still another work which he performs, and his connection with which is not so obvious. Trees and vegetables grow upon the earth, and when burned they give rise to heat, and hence...