. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 318 COMPARATIVE PHYSIOLOGY. the tissues, but whether this is used in the manufacture of taurocholic acid or whether the latter is made entirely anew, and possibly by a method in which taurin never appears as such, is an open question. It is highly probable that a portion of the bUe poured into the intestine is absorbed either as such or after partial decomposition, the products to be used in some way in the econo- my and presumably in the construction of bile by
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 318 COMPARATIVE PHYSIOLOGY. the tissues, but whether this is used in the manufacture of taurocholic acid or whether the latter is made entirely anew, and possibly by a method in which taurin never appears as such, is an open question. It is highly probable that a portion of the bUe poured into the intestine is absorbed either as such or after partial decomposition, the products to be used in some way in the econo- my and presumably in the construction of bile by the liver. There are many facts, including some pathological phe- nomena, that point clearly to the formation of the pigments of bUe from haemoglobin in some of its stages of de- generation. Pathological.—When the liver fails to act, either from derange- ment of its cells prima- rily or owing to obstruc- tion to the outflow of bile leading to reabsorp- tion by the liver, bile acids and bile pigments appear in the urine or may stain the tissues, indicating their presence in ex- cess in the blood. This action of one gland (kidneys) for another is highly suggestive, and especially important to bear in mind in medical practice, both in treatment and prognosis. The chances of re- covery when only one excreting gland is diseased are much greater evidently than when several are involved. Such facts as we have cited show, moreover, that there are certain common fundamental principles underlying secretion everywhere—a statement which will be soon more fully • Fig. 359. —Portion of transverse section of hepatic lobule of rabbit magnified 400 diameters (KOUi- ker). 6,|6,6, capillary blood-Tessels; g, g, g, cap- illary bile-ducts; I, I, l, liver-cells. THE NATURE OP THE ACT OF SECRETION. We are now about to consider some investigations, more particularly their results, which are of extraordinary interest. The secreting cells of the salivary, the pancreatic glands,. P
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