. Elementary physics and chemistry: first stage . THE SENSES. 3 Even when you are in )-our places, away from the table, and not looking at it, you know that there is something unusual near you. You say there is a smell in the room. Two or three things on the table have a strong smell or odour, and by means of this you could be quite sure of their presence. Smelling' is another power you have which you will use in your studies of science. When you want to learn exactly what a smell is like you sniff the air up your noses from near the object which gives rise to Fig. are very •' .
. Elementary physics and chemistry: first stage . THE SENSES. 3 Even when you are in )-our places, away from the table, and not looking at it, you know that there is something unusual near you. You say there is a smell in the room. Two or three things on the table have a strong smell or odour, and by means of this you could be quite sure of their presence. Smelling' is another power you have which you will use in your studies of science. When you want to learn exactly what a smell is like you sniff the air up your noses from near the object which gives rise to Fig. are very •' ... clever in nnding people by smell. the smell, and evidently it is by means of your noses that you are able to smell. Some animals, like the bloodhound, have this power to a great degree, and are very clever in finding the whereabouts of objects from their smell. In this way they used to be employed to find runaway slaves. Hearing.—If the bell on the table is struck you become aware of its presence through your ears. You hear the sound to which the bell gives rise. Or, if you drop the piece of sugar, or one of the other objects, after raising them from the table, the noise which results when the object strikes the table is quite enough to tell you that something is there. Hearing, a power which all people have who are not deaf, is another way of learning facts. Every day of your lives you make use of hearing in this way. Perhaps you know it is time to get up, because you hear the milkman shouting in the street, or because the alarum clock goes off, or someone calls you. You know a letter has arrived because of the postman's knock. You are sure there are birds in the trees because you hear them singing. You will be able to think of many other ways for yourself. Tasting. — Even yet you have not found all the ways by which you learn facts about the objects around you. A boy, who could neithw see, nor feel, nor smell, nor hear an object, might still be able to tell there was
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