This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...signal service? Experiment 3.--Press the mouth of an "empty" bottle down into some water: why does it not enter? (Air can not escape.) Push a dry sponge quickly under water and then remove it. Why has the water not wet it all through 2 Weigh some clean corks. Immerse quickly, and weigh again. Why have they ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...signal service? Experiment 3.--Press the mouth of an "empty" bottle down into some water: why does it not enter? (Air can not escape.) Push a dry sponge quickly under water and then remove it. Why has the water not wet it all through 2 Weigh some clean corks. Immerse quickly, and weigh again. Why have they gained so little in weight? Stuff a wide-mouthed bottle full of cotton, wool, or cork, and add all the water it will hold. Quickly cork and invert. After twenty-four hours observe. What is in the top of the bottle? (Air.) Is the cork, etc., now wet? As the air got out, the water got? (In.) In succession dip the different kinds of buds in water and record why the water wets them so little. Immerse an apple. Why does it not become very wet? (Wax.) Do the same with an orange. Why not wet? (Oily.) What ways can you now give by which a plant keeps out wet? Experiment 4.--Balance a sound, uncut potato by a pared one. After twenty-four hours' drying, which has lost the most? Why? (Corky covering gone.) Take two similar sound apples and treat as the potatoes. Why? (Waxy covering.) - See 42, Step XIX. t Ibid. % Enoyc. Brit., Ice, or Tyndall's Molecular Physics, p. 399. Do the same with two oranges or lemons. Why? (Oily coat gone.) Cut inch-thick sticks of several green woods and varnish the cut ends. Weigh pairs, and then split one of each through the middle and leave for several days and weigh again. Why has the split stick dried faster? (Corky layer broken.) Select similar pairs of hickory and of poplar twigs. Varnish the cut ends of each, and then split one end open and expose both to the same air. Which dries fastest? Why? Take four equal sized pieces of cotton cloth and soak them well in water. Hang one in the sun, one in the shade, one in the...
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