Issue 11 and Volume 37.

FIRST AID TO THE INJURED. Speciallly written for FIRE AND WATER ENGINEERING. CHAPTER III.-RESPIRATION. (Continued.) As the presence of considerable carbonic acid and other impurities is hurtful to the blood, it must be thrown off into the air of the lungs, and oxygen must take its place. It has been shown how easily the blood accomplishes this, and how from that air of the lungs it sucks in all the oxygen required for nourishing the system. The blood which supplies this nourishment to the tissues is spread out to take up oxygen, that gas being necessary for the burning up of the food which has been absorbed. This blood, it may be noticed, winds along through a network of the thinnest of capillaries. It is spread out, for instance, over the alimentary canal by such a network, and therefrom absorbs nutriment for strengthening the tissues of the body. As it…

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