. 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. Lottie.—To keep the water in at the sides. Teacher,—You must look carefully at all the streams after this. Youwill always find three slopes. To-morrow we shall study some high are called Class.—Mountains. {Dismissed.) 28 Primary Molding in Fig. II. The Spring. 1. The child is allowed to pour some water upon sand, and tofind that the moisture soon passes through it. The water sinks th
. 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. Lottie.—To keep the water in at the sides. Teacher,—You must look carefully at all the streams after this. Youwill always find three slopes. To-morrow we shall study some high are called Class.—Mountains. {Dismissed.) 28 Primary Molding in Fig. II. The Spring. 1. The child is allowed to pour some water upon sand, and tofind that the moisture soon passes through it. The water sinks through the sand freely. There are emptyspaces between the little grains of sand, and the water readilypasses among such spaces. Sand is loose and porous [pervious], and may become like akind of sponge, filled with the water from the surface of theground. 2. Let the children pour some water upon a quantity of clay,and find that the tough clay does not allow the water to passthrough. The little particles of clay fit close to each cannot pass through the mass of is impervious. Many rocks are porous, and are also cracked or may pass down through the beds of many close-grained Primary Molding in Sand. 29 rocks, such as limestone or sandstone, because there are many-joints or cracks. 3. The children are allowed to build up a hill of clay, and Q!s^^^^
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