Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . ined, the separation into thequicker stream of blood-corpuscles in the centre, and of theslower one of liquor sanguinis in the circumference above in-dicated, has been observed. But the circulation of the respi-ratory apparatus, whe-ther lungs or gills, offersa most remarkable ex-ception to this rule, souniform in reference tothe circulation at capillaries of therespiratory organ arefilled with blood gene-rally, i. e. liquor san
Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges . ined, the separation into thequicker stream of blood-corpuscles in the centre, and of theslower one of liquor sanguinis in the circumference above in-dicated, has been observed. But the circulation of the respi-ratory apparatus, whe-ther lungs or gills, offersa most remarkable ex-ception to this rule, souniform in reference tothe circulation at capillaries of therespiratory organ arefilled with blood gene-rally, i. e. liquor san-guinis, with its super-added blood and lymph-corpuscles, — to their Fig. 231.—One of the pulmonary islets very walls (figs. 230 andbounded by capillaries on three sides, by a 231.) It is only in thelarger venous branch on the fourth side, larger capillary vesselsa, b, c are lymph-globules mingled with the tjiat a tllin stratum ofblood-globules. The object is magnified i • f h • about 300 times. plasma is contact with theparietes, which are much more delicate than those of the systemiccirculation, and not, like them, formed of a series of dark. OF THE BLOOD AND CIECTJLATION. 215 fibrous layers. The circulation through the lungs of the waternewt is a very beautiful object (fig. 230). The pulmonaryarteries (d} here expand very speedily into a fine-meshednet-work of intermediate vessels, which in general admit nomore than single files of blood-corpuscles playing around veryminute islets of the parenchyma of the lung (fig. 231). Thevessels always appear with distinct parietes, and terminatepartly in capillary veins of the same character as themselves(fig. 230), partly in larger venous trunks. The blood-corpus-cles mixed with lymph-corpuscles (fig. 231, c),as already stated,fill both arteries and veins close to their parietes. The sameappearances are presented in the branchial fringes of the larvaof the water-newt.]* * Professor Wagners Physiology, page 294, et seq. CHAPTER
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1870
