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Page 495 - Or hear'st thou rather pure ethereal stream, Whose fountain who shall tell ? before the sun, Before the heavens thou wert, and at the voice Of God, as with a mantle, didst invest The rising world of waters dark and deep, Won from the void and formless infinite.
Page 240 - It would be so, unless the parts destroyed were perpetually renewed ; but as a lamp will not go out so long as it is supplied with fresh oil, neither will the body be consumed so long as it is supplied with sufficient food. Q. What is the principal difference between the combustion of a fire or lamp, and that of the human body ? A.
Page 157 - Q. What is CARBONIC ACID GAS ? A. A gas formed by the union of carbon and oxygen : It used to be called
Page 275 - What is the DIFFERENCE between a THERMOMETER and a BAROMETER ? A. In a, THERMOMETER the mercury is sealed up from the air; and rises or falls, as the varying- temperature of the air expands or contracts it : but In a BAROMETER the mercury is left exposed (or open) to the air ;* and rises or falls, as the varying1 weight of the air presses upon the open column.
Page 549 - ... the key becomes at that distance too weak to support the weight of the nail. That this is the real cause of its falling off may be proved by taking a still lighter fragment of iron, such as a piece of very slender wire, and applying it to the key. The magnetism of the key will still be sufficiently...
Page 342 - Because it freezes first at the sides of the foot-prints; other crystals gradually shoot across, and would cover the whole surface, if the earth did not absorb the water before it had time to freeze.
Page 568 - TO FIND THE DIFFERENCE BETWEEN TWO NUMBERS, THE GREATER OF WHICH IS UNKNOWN. TAKE as many nines as there are figures in the smaller number, and subtract from them the amount of the number. Request some one to add the difference to the larger number, to take away the first figure of the total, and add it to the last one, and the sum then produced will be the difference between the two numbers. For example : — John, who is 22, tells George, who is some years older, that he can find out the difference...
Page 94 - If you WET your FINGER in your mouth, and hold it up in the air, why does it FEEL COLD ? A. Because the saliva quickly evaporates ; and (as it evaporates) absorbs heat from" the finger, making it feel cold.
Page 216 - ... fusibility. The glazing is performed by throwing common salt into the heated furnace ; this is volatilized, and decomposed by the joint agency of the silica of the ware, and of the vapour of water always present ; hydrochloric acid and soda are produced, the latter forming a silicate, which fuses over the surface of the ware, and gives a thin, but excellent glaze.