. Elementare Physik und Chemie: erste Etappe. Wissenschaft. Elementare Physik und Chemie. Arbeit, dass hatten wir etwas, das unsere entgangen ist, unsere Aufgabe wäre leichter gewesen, und das Ergebnis mehr als zufriedenstellend. Wird es am Besten für uns, dann, bevor wir unsere Studie dieses neue Thema, Wissenschaft beginnen, um sicherzustellen, dass wir alle Möglichkeiten des Lernens, die es möglich ist, zu nutzen wissen. Dies mag auf den ersten sehr schwierig; aber, wirklich, es ist nichts von der Art, wie wir bald erfahren. Jeder Junge oder Mädchen in der Klasse wird feststellen, dass es einige Dinge auf den Tisch. Wie können Sie

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. Elementary physics and chemistry: first stage. Science. ELEMENTARY PHYSICS AND CHEMISTRY. labour, that had we remembered something which has escaped our notice, our task would have been easier and the result more satisfactory. It will be best for us, then, before we begin our study of this new subject, science, to make sure that we know all the ways of learning which it is possible to use. This may seem at first very difficult ; but, really, it is nothing of the kind, as we shall soon find out. Every boy or girl in the class will notice that there are several things on the table. How do you know that this is so ? Everyone of you has learned the fact in the same way. You say that you know there are things on the table because you see them, or, as some of you said, by seeing. But you must go a little farther. Seeing.—When can you see ? You are able to see when it is light and when your eyes are open. Even if it is light and your eyes are shut you cannot see. Or, if your eyes are open and it is dark you cannot see. Seeing is only possible when there is light and you have open eyes. But your eyes must be in a healthy condition. Some people with open eyes cannot see, because their eyes are unsound or diseased. They are called blind people. Feeling.—But though blind people cannot see they could still tell there were things on the table. Even when your eyes are shut you can quite easily find out the things you can no longer see. How do you manage it ? By feeling them or touching them. It would take you very much longer to learn all there is to be learnt about one of the substances on the table by feeling it than it does by seeing it. But if you were to practise this way of learning what a thing is like you would after a time become very clever at it. Blind people are clever enough to recog- nise their friends by feehng all over their faces. Though you generally feel with your fingers, the skin of all parts of your body is able to tell you when an object touches it. S

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• bookcentury1800
• bookdecade1890
• bookpublishe
• booksubjectscience