. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. ontain uric acid, opening into the intestine near its anal orifice. InInsects, we often meet with prolonged tubes, resembling the biliary ves-sels in form, and terminating in the same situation; in some species theseare dilated near their extremity into a receptacle for their secretion, or aurinary bladder. Throughout the Vertebrated classes they exist in a still * Among the Mollusca, the chyle is absorbed by the mesenteric veins, there be
. Principles of human physiology : with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students. ontain uric acid, opening into the intestine near its anal orifice. InInsects, we often meet with prolonged tubes, resembling the biliary ves-sels in form, and terminating in the same situation; in some species theseare dilated near their extremity into a receptacle for their secretion, or aurinary bladder. Throughout the Vertebrated classes they exist in a still * Among the Mollusca, the chyle is absorbed by the mesenteric veins, there beingno separate lacteal system. These veins, instead of returning to the heart throughthe liver, terminate in the branchial vessels; and the processof depuration iseffectedby the gills. Their liver is supplied only by the hepatic 514 OF SECRETION. more evident form. They are uniformly composed of a congeries ofprolonged tubes, sub-dividing and ramifying more or less, which springfrom the ureter or efferent duct, and terminate either in blind extremities,or in a plexus formed by their inosculation. There are considerable va- Fie. 67. Fig. ^.: A section of the kidney, surmounted by thesupra-renal capsule. 1. The supra-renal cap-sule. 2. The vascular portion. 3, 3. Its tubu-lar portion, consisting of cones. 4,4. Two ofthe calices, receiving the apex of their cor-responding cones. 5, 5, 5. The three infundi-bula. 6. The pelvis. 7. The ureter. Portion of the kidney of a new-born Natural size; a, a, Corpora Malpighiana,as dispersed points in the cortical substance;6, papilla, b. A smaller part magnified; a, a,Corpora Malpighiana: b, tubuli uriniferi.(After Wagner.) riations in the arrangement of these tubes, however, in different tribesof animals. In Fishes, the Kidneys very commonly extend the wholelength of the abdomen; and they consist of tufts of uniform-sized tubules,which shoot out transversely at intervals from the long ureter. These tubesfrequently div
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