Practical Lessons in ScienceWerner Company, 1894 - 395 pages |
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Expressions et termes fréquents
abundant action ammonia animals atoms becomes birds body bones burning calcium called calyx carbon dioxide cavity cells chemical chlorine coal coil color combined combustion common composed compounds consists contains copper crust developed earth electricity elements energy feldspar flame flowers force gases gills glands glass gravity heat hydrochloric acid hydrogen insects interesting iodine iron jaws lakes leaf leaves lens light lime limestone liquid magnet mass matter maxillæ mercury metal mineral molecules motion nitric acid nitrogen notice organs ovary ovules oxide oxygen phosphorus pistil plants portion potassium potassium chlorate pressure protoplasm quantities rays regions river rocks salt sand sediments seed sepals shell silicate Silurian sodium solid solution sometimes species specific gravity stamens stem streams substances sulphate sulphuric acid surface temperature tion tissue trees tube usually vapor varies vegetable vibrations waves weight winds wire wood zinc
Fréquemment cités
Page 380 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
Page 383 - The doctrine of evolution asserts, as the widest and deepest truth which the study of nature can disclose to us, that there exists a Power to which no limit in time or space is conceivable, and that all the phenomena of the universe, whether they be what we call material or what we call spiritual phenomena, are manifestations of this infinite and eternal Power.
Page 90 - Having made a kite by stretching a silk handkerchief over two sticks in the form of a cross, he went out into a field, accompanied only by his son : raised his kite ; fastened a key to the lower end of its hempen string ; insulated it by fastening it to a post by means of a silk cord, and anxiously awaited the approaching storm. A dense cloud, apparently charged with lightning, soon passed over the spot where he stood, without causing his apparatus to give any sign of electricity. He was about to...
Page 65 - The power is applied to the circumference of the wheel, and the weight to the circumference of the axle.
Page 10 - It is directly concerned with the air we breathe, the water we drink, the food we eat, the materials upon which we expend our labor, and the things which we buy and sell.
Page 50 - ... must be some point in the pendulum, at which these two struggles just balance each other. This point will vibrate just as fast as if it were influenced by no other molecules whatever. A. point in the pendulum which vibrates as if only under the influence of its own gravitation and inertia is called the center of oscillation. The center of oscillation is generally a little below the center of gravity of the pendulum ball.