. Lessons in nature study. Nature study. go NATURE STUDY by a fine wire at the mouth of the balloon is lighted. In a town, or in the country during the dry season, this should not be at- tempted from the danger of fire. The hot air balloon showing a heated mass of air rising to a great height illustrates vividly how larger masses of air lying next the ground, which is heated by the rays of the sun, will become heated and rise. The cooler air comes rushing in as it pushes the hot air up. The balloon may be made to illustrate this last point also. In the school room when the balloon is well fill
. Lessons in nature study. Nature study. go NATURE STUDY by a fine wire at the mouth of the balloon is lighted. In a town, or in the country during the dry season, this should not be at- tempted from the danger of fire. The hot air balloon showing a heated mass of air rising to a great height illustrates vividly how larger masses of air lying next the ground, which is heated by the rays of the sun, will become heated and rise. The cooler air comes rushing in as it pushes the hot air up. The balloon may be made to illustrate this last point also. In the school room when the balloon is well filled with hot air, quickly turn it upside down and observe the sudden rush of hot air up out of its mouth and the equally sudden crushing together of the sides of the balloon made by the cooler air rushing toward it. Currents in Water. Fill a glass flask about two-thirds full of water into which there has been sprinkled some fine chalk dust that will show any move- ments in the water. Place the flame of a can- dle or alcohol lamp under the flask. Immedi- ately currents of water will start from the bottom to the top, and down the sides to the bottom. As these are caused in the same way in which the cur- rents in the air take place, their explanation can easily be arrived at. If a glass jar of water, the larger the better, has sprinkled over its surface some fine dust of an aniline dye, the particles of the dye as they sink and dissolve make delicate colored threads in the water. By heating either the sides or bottom of the jar ever so slightly currents are formed as shown in the swaying of the colored 58. Cunents 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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