. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 806. COMPARATIVE PHYSIOLOflV. tue of a trace of copper milpliate added to a few drops of caustic alkali, which becomes red if this body be present. 4. After a few hours the smell becomes fsecal, owing in part to indol, which gives a violet color with chlorine-<vator; while under the microscope the digesting mass may be seen to be swarming with bacteria. 5. When digestion has p
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 806. COMPARATIVE PHYSIOLOflV. tue of a trace of copper milpliate added to a few drops of caustic alkali, which becomes red if this body be present. 4. After a few hours the smell becomes fsecal, owing in part to indol, which gives a violet color with chlorine-<vator; while under the microscope the digesting mass may be seen to be swarming with bacteria. 5. When digestion has proceeded for some time, leuein and tyrorin may be shown to be present, though their satisfactory separation 'in crystalline form involves somewhat elaborate details. These changes are owing to self-digestion of the gland. All the properties of this secretion may he demonstrated mora satisfactorily by making an aqueous or, bettor, glycerin extract of the pancreas of an ox, pig, ete., dnd carrying on arti- ficial digestion, as in the case of a peptic digestion, with fibrin. In the case of the digestion of fat, the emulsifying power of a watery extract of the gland may be shown by shaking up a little melted hog's lard, olive-oil (each quite fredi, so as to show no acid reaction), or soap. Kept under proper conditions, free acid, the result of decomposition of the neutral fats or soap into free acid, eto., ma,y be easily shovm. The emulsion, though allowed to stand long, persists, a fact which is availed of to produce mora palatable and easily assimilated praparations of cod-liver oil, eibo., for medicinal use. Starch is also converted into sugar with great ease. In short, the digestive juice of the pancreas is the most complex and complete in ite action of the whole series. It is amylolytic, proteolytic, and steaptic, and these powers have been attributed to three distinct ferments—omytopwn, triptin, and ateapsin. Proteid digestion is carried further than by the gastric juice
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