Knowledge of natural history, revfrom Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom . onIn sad divorce this double flight must end.—Young. 83. The right lung is divided into three parts or lobes; the left lung is divided into two lobes,between which is a spacewhere the point of the heartlies. Each lung is containedin a small membranous bagcalled the pleura, and the air-vessels which are connectedwith the windpipe, throughwhich we brea
Knowledge of natural history, revfrom Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom . onIn sad divorce this double flight must end.—Young. 83. The right lung is divided into three parts or lobes; the left lung is divided into two lobes,between which is a spacewhere the point of the heartlies. Each lung is containedin a small membranous bagcalled the pleura, and the air-vessels which are connectedwith the windpipe, throughwhich we breathe, run alongbetween the blood-vessels inthe lungs, and so give tothem that quantity of airwhich is required to changethe color of the blood and torender it fit for accompanying engravingwill serve to illustrate thestructure and position of thelungs: in the center is a mem-&§?/&?3f* ;< \ ;^ \^i £ brane which divides the chest. til The ribs are cut off, so asto show the inside of thechest. The diaphragm whichdivides the chest from theabdomen has been three lobes of the righthmg and the two lobes of the left lung are shown in their proper posi-tions; g is the windpipe through which air is 84. Why are the lungs capable of indicating whetheran infant found dead has been still-born or not? Because lungs which have never breathed are heavierthan water, and sink; but lungs which have breathed, ifonly once, are lighter than water, and swim. 85. The lungs, previously to birth, are compressed like a squeezedsponge, and expand whenever the pressure is taken off. The momentthey expand the air rushes in by the nostrils and mouth; and the forcewith which it enters causes the expansion a little beyond the naturalstate. This acts as a stimulus upon the muscles, which immediatelycontract, diminish the cavity of the chest, and, in conjunction with theelasticity of {Jie lungs, expel the air till the lungs are again reducedto less than their natural c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1916
