. The physiology of digestion : considered with relation to the principles of dietetics . arrival at the upper part of the chest the thoracicduct crosses over and opens into the vein S, just beforethe latter reaches the rightside of the heart, so thatthe chyle is there poured in-to the circulating current ofthe venous blood. Such is the course of thechyle. But the lacteal ab-sorbents, in their progressfrom the intestine to thethoracic duct, pass throughthe small glandular bodiescalled the mesenteric glands(M G, p. 154,) where somechange, the nature of whichis not at all understood, isproduced
. The physiology of digestion : considered with relation to the principles of dietetics . arrival at the upper part of the chest the thoracicduct crosses over and opens into the vein S, just beforethe latter reaches the rightside of the heart, so thatthe chyle is there poured in-to the circulating current ofthe venous blood. Such is the course of thechyle. But the lacteal ab-sorbents, in their progressfrom the intestine to thethoracic duct, pass throughthe small glandular bodiescalled the mesenteric glands(M G, p. 154,) where somechange, the nature of whichis not at all understood, isproduced upon the chyle,but which seems, neverthe-less, to be of importanceto its constitution. Wherethese glands are hardenedand enlarged, as they oftenare in scrofulous childrenwith large prominent belliesand thin bodies, nutrition is greatly impaired, although the appetite and stoma-chic digestion remain comparatively unaffected. The reason why the chyle is caried so far, to bepoured into the current of the venous blood just beforethe latter reaches the right side of the heart, is on con-14. 158 INTESTINE CONVERSION OP THE CHYLE sideration not less obvious than cogent. Chyle itselfis not fitted to become a constituent part of the ani-mal frame. Before it can become so it inust be convert-ed into blood; and this can be effected only by exposingit to the action of the air in the air-cells of the lungs ina state of intimate mixture with the venous admixture, again, is insured by the gradual wayin which the chyle advances along the thoracic ductand falls into the circulating current almost drop bydrop ; and it takes place just before the dark blood hasfinished its course, and is again subjected to completeaeration in its passage through the lungs. As explain-ed in the former volume, this aeration is so indispensa-ble to the renovation of the old and the formation ofnew blood, that whenever it is rendered imperfect,either by obstructions in the lungs themselves, or bythe absenc
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