. Lessons in nature study. Nature study. 32 NATURE STUDY Place the flask on the stove, or over an al- cohol lamp, and have the class observe the result, and, if they can do so, explain why the water rises. If the simple explanation that the heat makes the water larger (ex- pands it), is not given, do not give it but al- low them more time to think ou the mat- ter. If wrong explanations are offered do not immediately reject them, but ask for proofs or devise experiments which disprove the ofl^ered explanation. For example, if a child insists that the water rises in the tube " because heate
. Lessons in nature study. Nature study. 32 NATURE STUDY Place the flask on the stove, or over an al- cohol lamp, and have the class observe the result, and, if they can do so, explain why the water rises. If the simple explanation that the heat makes the water larger (ex- pands it), is not given, do not give it but al- low them more time to think ou the mat- ter. If wrong explanations are offered do not immediately reject them, but ask for proofs or devise experiments which disprove the ofl^ered explanation. For example, if a child insists that the water rises in the tube " because heated water is lighter and goes up," place the apparatus so that it extends in a horizontal position, and repeat the experi- ment. The above may occupy the time of more than one lesson. It ought not to be hurriedly passed over. In subsequent lessons it maybe proposed to experiment with other liquids. Allow the children to select the liquids, arrange the apparatus, end try the experiments as far as possible. The effect of cold may be studied also. When a few liquids are thus experimented with and comparisons made between them, the thermometer may be introduced. It is to be seen as a small flask filled with mercury, or with colored alcohol. A number of simple experiments can be Jevised with the thermometer which will make clear its use in Jeterminiug the temperature of things. In all experiments give as much chance as possible for each. Fig. 53 lixpiiiibion water by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jenkins, Oliver Peebles; Kellogg, Vernon L. (Vernon Lyman), 1867-1937. joint author. San Francisco, The Whitaker & Ray Company
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