World-life; Or, Comparative Geology, Parte 1S.C. Griggs, 1883 - 642 pagine |
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Parole e frasi comuni
acceleration actual Amer amount angular velocity annulation assumed Astronomical atmosphere attraction axis body cause central centre of gravity centrifugal force centrifugal tendency centripetal centripetal force comets conceived condensation condition contraction cooling cosmical cosmical dust crust density derived spheroid diameter diminished direct motion distance earth epoch equator equatorial evolution exerted existence Faye feet fluid force friction greater heat Herschel hypothesis increase incrustation influence Jour Jupiter Laplace liquid lunar mass matter meteoric meteoroidal miles moon moon's mountain move movements Nature nebula nebular theory nucleus ocean origin particles perihelion period phenomena physical planet planetary planetary orbits portion position present pressure primitive probably prolate radius regions relative result retardation retrograde motion rigid ring ringlet rotary motion rotation satellites Saturn sediments solar nebula solar system solid space spectrum spiral stage stars sun's supposed surface temperature terrestrial tidal action tide tide-bearer tide-producer tion Uranus vapor viscosity zodiacal light zone
Brani popolari
Pagina 489 - Within a finite period of time past, the earth must have been, and within a finite period of time to come, the earth must again be, unfit for the habitation of man as at present constituted...
Pagina 51 - Perhaps the whole frame of nature may be nothing but various contextures of some certain ethereal spirits or vapours, condensed as it were by precipitation...
Pagina 493 - It is impossible, by the unaided action of natural processes, to transform any part of the heat of a body into mechanical work, except by allowing heat to pass from that body into another at a lower temperature.
Pagina 54 - we may conceive that in remote ages the temperature of matter was much higher than it is now, and that these other things [the ideal elements] existed in the state of perfect gases — separate -existences — uncombined.
Pagina 55 - The recent researches of Henry Ste. -Claire Deville and others go far to show that this breaking up of compounds, or dissociation of elements by intense heat, is a principle of .universal application ; so that we may suppose that all the elements which make up the sun or our planet would, when so intensely heated as to be in...
Pagina 535 - The phenomena furnish us the grounds for the generalization of two laws which are truly principles of scientific divination, by which alone the human mind penetrates the sealed records of the past and the unopened pages of the future. The first of these is the law of evolution, or, to phrase it for our purpose, the law of correlated successiveness or organized history in the individual, illustrated in the changing phases of every single maturing system of results.
Pagina 600 - ... has amply provided for the preservation of the whole, though it should not appear to us in what manner this is effected. But I shall moreover point out several circumstances that do manifestly tend to a general preservation; as, in the first place, the indefinite extent of the sidereal heavens, which must produce a balance that will effectually secure all the great parts of the whole from approaching to each other.
Pagina 50 - And as the earth, so perhaps may the sun imbibe this spirit copiously, to conserve his shining, and keep the planets from receding further from him : and they that will may also suppose that this spirit affords or carries with it thither the solary fuel and material principle of light, and that the vast ethereal spaces between us and the stars are for a sufficient repository for this food of the sun and planets.
Pagina 172 - For while comets move in very eccentric orbs in all manner of positions, blind fate could never make all the planets move one and the same way in orbs concentric, some inconsiderable irregularities excepted which may have risen from the mutual actions of comets and planets upon one another, and which will be apt to increase till this system wants a reformation.
Pagina 494 - Apparently, the universally coexistent forces of attraction and repulsion, which, as we have seen, necessitate rhythm in all minor changes throughout the Universe, also necessitate rhythm in the totality of its changes — produce now an immeasurable period during which the attractive forces predominating, cause universal concentration, and then an immeasurable period during which the repulsive forces predominating, cause universal diffusion — alternate eras of Evolution and Dissolution.