. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. OF DIGESTION. 101. with the veins, forming also in their course several glaniular masses, as seen in a portion of intestine connected with a vein in Fig. 54: and it is not until thus taken up and mingled with the circulating blood, that any of our food really becomes a part of the living body. Thus freed of the nutritive portion of the food, the residue
. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. OF DIGESTION. 101. with the veins, forming also in their course several glaniular masses, as seen in a portion of intestine connected with a vein in Fig. 54: and it is not until thus taken up and mingled with the circulating blood, that any of our food really becomes a part of the living body. Thus freed of the nutritive portion of the food, the residue of the product of digestion passes on to the large intestine, from whence it is expelled in the form of excrement. -^^o ^** 211. The organs above described constitute the most es-sential for the process of digestion, and are found more or lessdeveloped in all but some of the radiated animals; but thereare, in the higher animals, several additional ones for aidingin the reduction of the food to chyme and chyle, which rendertheir digestive apparatus quite complicated. In the first place,hard parts, of a horny or bony texture, are usually placed aboutthe mouth of those animals that feed on solid substances, whichserve for cutting or bruising the food into s
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