Systematic Science Teaching a Manual of Inductive Elementary Work for All Inst
Systematic Science Teaching a Manual of Inductive Elementary Work for All Inst
Edward Gardiner Howe
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How can decay be avoided ? (By cleaning with a stiff brush and water after each meal. ) How can we tell that decay has gone far ? (Toothache. ) What use for feeling in our teeth ? (To aid in chewing, and to warn. ) If some hot water is dashed on cold glass, what is apt to happen ? (Break. ) If hot glass is suddenly cooled ? (Same. ) What has this to do with our teeth ? (Bad to drink very hot or cold drinks, especially following each other. ) STEP XIX. ANIMALS. 227 Is there any other way of crac...king the " enamel, " as the hard covering is called ? (By biting nuts and hard things. ) Is this wise? (No, only ignorant or foolish people do so. ) * 23. Saliva. T What uses do we know for the saliva? (Dissolves for taste, and softens. ) There is another very important use. Arrange some time with the children when experiments can be tried, and then proceed : Will suppose there are 10 in the class. Here is a can (large tin fruit-can will do well) of water which we will set to heat. Let us make 6 nearly equal- sized pieces of this bread (no crust), and 6 of the white, solid part of this boiled potato.
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