. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. DIGESTION OF FOOD. 309 and we have seen how saliva varies, according as the animal is fasting or feeding, etc. Bearing in mind, then, that our knowledge is possibly only approximately correct, we may state what is known of the se- cretions of the stomach. The gastric secretion is clear, colorless, of low specific grav- ity (1001 to 1010)5 the solids being in great part made up of pep-. Fia. 267.—Gastric fistula in case of St. Martin (after Beaumont
. A text-book of animal physiology, with introductory chapters on general biology and a full treatment of reproduction ... Physiology, Comparative. DIGESTION OF FOOD. 309 and we have seen how saliva varies, according as the animal is fasting or feeding, etc. Bearing in mind, then, that our knowledge is possibly only approximately correct, we may state what is known of the se- cretions of the stomach. The gastric secretion is clear, colorless, of low specific grav- ity (1001 to 1010)5 the solids being in great part made up of pep-. Fia. 267.—Gastric fistula in case of St. Martin (after Beaumont). A, A, A, B, borders of open- ing into stomach ; C, left nipple ; D, chest; E, cicatrices from wound made for removal of a piece of cartilage ; F, F, F, cicatrices of original wound. sin with a small quantity of mucus, which may become excess- ive in disordered conditions. There has been a good deal of dispute as to the acid found in the stomach during digestion. It is now generally agreed that during the greater part of the digestive jjrocess there is free hydrochloric acid to the extent of about "3 per cent. It is maintained that lactic acid exists normally in the early stages of digestion, and it is conceded that lactic, butyric, acetic, and other acids may be present in certain forms of disordered digestion. It is also generally acknowledged that in mammals the work of the stomach is limited, so far as actual chemical changes go, to the conversion of the proteid constituents of food into peptone. Fats may be released from their proteid coverings (cells), but neither they nor starches are in the least altered chemically. Some have thought that in the dog there is a slight digestion of fats in the stomach. The solvent. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New Y
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