Manual of Science for Teachers: Containing Answers to the Practical Questions and Problems in the Author's Scientific Text-booksAmerican Book Company, 1888 - 206 páginas |
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Términos y frases comunes
absorbs acid action alcohol ammonia April Arithmetic Astronomy atmosphere axis ball becomes blood blue body bones Borelly brain burn carbonic carbonic acid causes cent center of gravity Chemistry class of lever cloth CO₂ Coggia cold color contained cool diameter difference distance earth eclipse ecliptic effect fall feet flame force gastric juice glass Goldschmidt grams H₂O heat hence horizon inches iron length less light lime liquid liters lungs Luther mercury metal miles moon motion move muscles nerves nervous object October 13 organs oxide oxygen Palisa particles pass pendulum Peters phosphoric acid phosphorus Physiology planet poison pole Popular Physics pressure produced Question rays reaction reflected rise salt Sept skin solar solar eclipses specific gravity stars stomach sulphate sulphur sulphuric acid sun's surface tannic acid temperature tion tons twilight vapor velocity vibration Watson weight zinc
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Página 116 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Página 124 - I had a dream, which was not all a dream. The bright sun was extinguished, and the stars Did wander darkling in the eternal space, Rayless, and pathless, and the icy Earth Swung blind and blackening in the moonless air...
Página 124 - The two great stars which mark the summit and the foot of the Cross having nearly the same right ascension, it follows hence, that the constellation is almost perpendicular at the moment when it passes the meridian. This circumstance is known to every nation that lives beyond the tropics, or in the Southern hemisphere. It...
Página 178 - What's this, now' ?" will one of us say ; " ah, detestable stuff' ! What a ridiculous fellow that man is' ! Will he never learn' ? Just the very thing I did not want. If he would only send down a bowl of fresh leek soup, or barley broth, there would be some sense in it :
Página 180 - I ought to have had at my present time of life has passed from me. I am getting weak, and peevish, and evil-disposed. A comparatively small trouble sits long -and sore upon me. Bile, from being my servant, is becoming my master ; and a bad one he makes, as all good servants ever do. I see nothing before me but a premature old age of pains and groans, and gripes and grumblings, which will, of course, not last over long; and thus I shall be cut short in my career when I should have been enjoying life's...
Página 125 - Lataniers, conversed together for the last time ; and where the old man, at the sight of the Southern Cross, warns them that it is time to separate !"— DE HUMBOLDT'S Travels.
Página 125 - To understand this, we must observe, what has been already mentioned, that the axis of the earth is inclined to the plane of its orbit 23J°, and it keeps always parallel to itself; that is, it is always directed to the same star.
Página 124 - It is a time-piece that advances very regularly nearly four minutes a day, and no other group of stars exhibits, to the naked eye, an observation of time so easily made. How often have we heard our guides exclaim in the savannas of Venezuela, or in the desert extending from Lima to Truxillo, • midnight is past, the cross begins to bend'.