. The hydropathic family physician : a ready prescriber and hygienic adviser with reference to the nature, causes, prevention, and treatment of diseases, accidents, and casualties of every kind . m a Greek word meaning the throat,one going to each lung. They then subdivide, and go on ramifyingagain and again, becoming smaller and smaller, and less and less elas-tic, until they ultimately terminate in the minute vesicles or air-cellsto which I have before alluded. These air-cells, with the air-tubesconducting to them, may be viewed as the framework of the lungs, andconstitute the greater propor
. The hydropathic family physician : a ready prescriber and hygienic adviser with reference to the nature, causes, prevention, and treatment of diseases, accidents, and casualties of every kind . m a Greek word meaning the throat,one going to each lung. They then subdivide, and go on ramifyingagain and again, becoming smaller and smaller, and less and less elas-tic, until they ultimately terminate in the minute vesicles or air-cellsto which I have before alluded. These air-cells, with the air-tubesconducting to them, may be viewed as the framework of the lungs, andconstitute the greater proportion of their substance. The cells, too,always contain more or less air; it is to them that these organs owetheir light and spongy character. The union of these little vesicles is effected through the mediumof a fine membrane, denominated cellular, which, though so abundantin many other structures of the body, is here very small in upon these cells minute vessels are ramifying, to carryto them blood to be acted upon by the vital air they are continuallyreceiving, and to convey it back again in its course to the heart, afterhaving undergone its mysterious aerial TBB BRONCHIAL TUHES. Of the Thorax, or Chest. 347 It appears to have been a grand principle of nature, in building upthe beautiful and important organs of respiration, to provide that thegreatest possible quantity of blood should be brought under the influ-ence of the greatest possible amount of air. The number of the air-cells exceeds all accurate calculation. They have been estimated inman at between one and two millions, and as presenting a surface offifteen hundred square feet. They exercise, too, as may readily be con-ceived, the most important agency in the breathing function, since itis during the passage of the blood over their delicate coats that the es-sential vital influence is wrought upon this fluid. Physiology of Respiration.—The general principle of respiration is asfollows:
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