Elements of Natural Philosophy: Arranged Under the Following Heads: Matter and Motion, The Universe, The Solar System, The Fixed Stars, The Earth Considered as a Planet, The Atmosphere, Meteors, Springs, Rivers, and the Sea, Fossils, Plants, Animals, The Human Frame, and The Human Understanding |
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acid alkalies animals annual appears atmosphere attraction axis become Birds blood bodies brittle called Cancer caudex circle clouds cold colour comets common consider creatures degree diameter discovered distance ductile earth eclipse eggs equal equator equinoctial existence feldspar fire fish fixed stars furnished globe greater heat heavens hemisphere hence high water hour human ideas inhabitants insects kinds less matter meridian metals miles mind mineral minutes moon motion move naptha nature noble metal north pole northern object observed opaque ophite orbit organs oviparous oxyd papillæ particles perfect perspiration planets porphyry produce quadrupeds quantity rain rays of light rivers round the sun salt Schorl season seeds smell solar solid space species specific gravity springs stones substance sulphur sun's supposed surface tion trees tropic tropic of Cancer tropic of Capricorn vapours various vegetable velocity viviparous weight whence whole wind
Popular passages
Page 214 - Consider what an affair this is, when we come to very large animals. The aorta of a whale is larger in the bore than the main pipe of the waterworks at London Bridge ; and the water roaring in its passage through that pipe is inferior, in impetus and velocity, to the blood gushing from the whale's heart.
Page 50 - A'ries, the Ram. Taurus, the Bull Gem'ini, the Twins. Cancer, the Crab. Leo, the Lion. Virgo, the Virgin. Li'bra, the Balance. Scorpio, the Scorpion. Sagittarius, the Archer. Capricornus, the Goat. Aquarius, the Water-bearer. Pisces, the Fishes.
Page 114 - All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they return again.
Page 213 - Each ventricle will at least contain one ounce of blood. The heart contracts four thousand times in one hour; from which it follows, that there pass through the heart, every hour, four thousand ounces, or three hundred and fifty pounds of blood. Now the whole mass of blood is said to be about twenty-five pounds ; so that a quantity of blood, equal to the whole mass of blood, passes through the heart fourteen times in one hour ; which is about once every four minutes.
Page 232 - Knowledge then seems to me to be nothing but the perception of the connexion and agreement, or disagreement and repugnancy, of any of our ideas.
Page 34 - two great Villages, one on the North Side, and the other on the South Side of the Fall," being respectively on or near the sites of Fort Frances and International Falls.
Page 16 - And thus Nature will be very conformable to her self and very simple, performing all the great Motions of the heavenly Bodies by the Attraction of Gravity which intercedes those Bodies, and almost all the small ones of their Particles by some other attractive and repelling Powers which intercede the Particles.
Page 233 - First, knowledge, whereby it certainly perceives, and is undoubtedly satisfied of the agreement or disagreement of any ideas. Secondly, judgment, which is the putting ideas together, or separating them from one another in the mind, when their certain agreement or disagreement is not perceived, but presumed to be so; which is, as the word imports, taken to be so before it certainly appears.
Page 206 - The extremities of these bony pieces, where they move and rub upon one another, must have smooth and slippery surfaces for easy motion. This is most happily provided for, by the cartilages and mucus of the joints. The interstices of all these parts must be filled up with some soft and ductile matter, which shall keep them in their places, unite them, and at the same time allow them to move a little upon one another.
Page 47 - ... decreases, in proportion as it recedes from the sides of the former conical shadow : this is called the penumbra. As the moon revolves round the earth, sufficiently near to pass through the shadow of the earth, an eclipse must always take place when these three are all in one straight line.