. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . cretion of mucuswhich must altogether amount to a large quantity, and it hasbeen suggested that this has other than lubricating or such likefunctions. It appears that mucus may be resolved into a pro-teid and an animal gum, which latter, it is maintained, likevegetable gums, assists emulsification of fats. If this be true,and the bile is, as has been asserted, possessed of the power tobreak up this mucus (mucin), its emulsifying effect in the in-testine may indirectly be considerable.
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . cretion of mucuswhich must altogether amount to a large quantity, and it hasbeen suggested that this has other than lubricating or such likefunctions. It appears that mucus may be resolved into a pro-teid and an animal gum, which latter, it is maintained, likevegetable gums, assists emulsification of fats. If this be true,and the bile is, as has been asserted, possessed of the power tobreak up this mucus (mucin), its emulsifying effect in the in-testine may indirectly be considerable. Bile certainly seems tointensify the emulsifying power of the pancreatic juice. There does not seem to be any ferment in bile, unless thepower to change starch into sugar, peculiar to this secretion insome animals, is owing to such. Comparative.—The bile of the carnivora and omnivora isyellowish-red in color; that of herbivora green. The formercontains taurocholate salts almost exclusively; in herbivorousanimals and man there is a mixture of the salts of both acids,tbough tbe glycocholate Fig. 240.—Gallbladder, ductus choledochus and pancreas in man (after Le Bon). _ a,gall-bladder: l>. hepatic duct; c, opening of second duct of pancreas; <l. openingof main pancreatic duct and bile-duct; e, e, duodenum; /, ductus choledochus; p,pancreas. DIGESTION OF FOOD. 305 Pancreatic Juice.—This fluid is found to vary a good dealquantitatively, according as it is obtained from a temporary(freshly made) or permanent fistula—a fact which emphasizesthe necessity for caution in drawing conclusions about thedigestive juices as obtained by our present methods. The freshest juice obtainable through a recent fistulousopening 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 inorganicmatter. Among the organic constituents the principal are albumin,alkal
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