. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. DIGESTION OF FOOD. 305 Pancreatic Juice.—This fluid is found to vary a good deal quantitatively, according as it is obtained from a temporary (freshly made) or permanent fistula—a fact which emphasizes the necessity for caution in drawing conclusions about the digestive juices as obtained by our present methods. The freshest juice obtainable through a recent fistulous opening in the pancreatic duct is clear, colorless, viscid, alka- line in reaction, and with a
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. DIGESTION OF FOOD. 305 Pancreatic Juice.—This fluid is found to vary a good deal quantitatively, according as it is obtained from a temporary (freshly made) or permanent fistula—a fact which emphasizes the necessity for caution in drawing conclusions about the digestive juices as obtained by our present methods. The freshest juice obtainable through a recent fistulous opening in the pancreatic duct is clear, colorless, viscid, alka- line in reaction, and with a very variable quantity of solids (two to ten per cent), less than one per cent being inorganic matter. Among the organic constituents the principal are albumin, alkaH-albumin, peptone, leucin, tyrosin, fats, and soaps in smaJl amount. The alkalinity of the juice is owing chiefly to sodium. FiQ. 247.—Crystals of leucin (Fanke). Pig. 248.—Crystals of tyrosin (Funke). carbonates, which seem to be associated with some proteid body. There is little doubt that leucin, tyrosin, and peptone arise from digestion of the proteids of the juice by its own action. Experimental—If the pancreatic gland be mostly freed from adhering fat, cut up, and washed so as to get rid of blood; then minced as fine as possible, and allowed to stand in one-per- cent sodium-carbonate solution at a temperature of 40° C, the following results may be noted: 1. After a variable time the reaction inay change to acid, owing to free fatty acid from the decomposition (digestion) of neutral fats. 2. Alkali-albu- min, or a body closely resembling it, may be detected and sep- arated by neutralization. 3. Peptone may be detected by the 20. 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 York, Appleton
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