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In normal health, our bodies give us very little trouble, but when the machinery becomes faulty, we are warned of the danger at hand by certain uncomfortable sensations which we know as pain. This pain serves a very useful purpose and is not merely to...
During the sleep the willing parts of the brain are at rest, and are only very scantily supplied with blood. Not until we are wholly awake do the centres of will get into action, and till then our voluntary acts are feeble, though acts not...
The water on one’s body is absorbed in the tiny spaces between the fibres of the towel in the same way as ink is taken up by the blotting paper.
A very hard, very smoothly glazed paper will scarcely absorb any ink. But a paper of loose texture, with a rough, unfinished surface like blotting- paper, absorbs ink just as a sponge sucks up water; and the water of the ink, instead of mainly remaining...
The Apteryx, or, as the natives call it, the Kiwi, is a peculiar bird with hardly any trace of wings. Found in New Zealand, where it was formerly very common, though now it is seen more rarely, it has a very long beak with nostrils...
Whenever anybody sings naturally, it sings about its feelings. The birds only sing when they must-when their feelings find their way out somehow. The feelings that birds sing about are always happy feelings. When a bird is ill or miserable or unhappy it never sings....
A particular kind of bird always produces the same kind of colour in its eggs, first as it produces a particular kind of colour in its feathers. This is a result of the particular chemistry of the body of the bird. The difference in colour...
Some force is produced which acts against gravitation and balances it when the bird maintains its level in the air, or more than balances it when the bird rises in the air. The necessary force is produced by burning the sugar in its muscles; in...
Through this hole enters the air which we blow out of the nozzle. When we part the handles, thereby opening the bellows, the air rushes in through the hole and when we bring the handles together, and so close the sides of the bellows, the...
The bee’s humming is made by the movement of its wings. Its wings move very quickly and as they move to and fro they set the air moving and it is the waves in the air that make them hum. The vibrations in the air...
