. Map modeling in geography : including the use of sand, clay putty, paper pulp, plaster of Paris, and other materials : also chalk modeling in its adaptation to purposes of illustration. Lottie.—Because the gas is heavier than —I have now collected some more ofthe gas. Charles may pour this clear lime-waterinto the bottle of gas. What change has takenplace, Dick ? Dick.—The water is now —This gas is called carbonic acid gas, and may be detected byits power to turn clear lime-water white. Here is a tumbler filled withlime-water. Florence may blow through this glass tu
. Map modeling in geography : including the use of sand, clay putty, paper pulp, plaster of Paris, and other materials : also chalk modeling in its adaptation to purposes of illustration. Lottie.—Because the gas is heavier than —I have now collected some more ofthe gas. Charles may pour this clear lime-waterinto the bottle of gas. What change has takenplace, Dick ? Dick.—The water is now —This gas is called carbonic acid gas, and may be detected byits power to turn clear lime-water white. Here is a tumbler filled withlime-water. Florence may blow through this glass tube into the —Oh, it turns white ! Teacher.—But is Florence a little volcano ? The same gas is given offby the lungs. We shall learn more about this in Physiology. You maycopy this sentence: Some volcanoes send forth carbonic acid gas, and the same kind of gasis exhaled by animals. Class may take Lesson XVI., subject, Mountains and MountainRanges. Turn to the map of South America, and learn the names of theprincipal ranges. Locate the —I have found one Fig. 20. Nature Study. 45 There should be a series of lessons upon the character of thesurface, the relation of slopes, brook basins, river basins, valleys,hills, and the other ways in which the correlation of form andgeography is manifested. It has been said that a grain of sand isa thought of God. We need not call the attention of the childto the distant and seemingly more marvelous things in naturebefore he gains some knowledge of the marvels under his real miracles lie nearest at hand. Let him study the sand,the gravel, and the clay. How were these materials formed,whence were they derived, and by what means were they laiddown in their present position ? How came the different rocksto occupy their places in the earth ? Are there any changes nowgoing forward on the face of the globe ? Study the action ofbrooks and rivers as they bear away the mud, the sand, and thegr
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