File:Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct - for the use of schools and colleges (1870) (14596063710).jpg

Identifier: outlinesofcompar00agas (find matches)
Title: Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges
Year: 1870 (1870s)
Authors: Agassiz, Louis, 1807-1873 Gould, Augustus A. (Augustus Addison), 1805-1866 Wright, Thomas, 1809-1884
Subjects: Physiology, Comparative Zoology
Publisher: London : Bell & Daldy
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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re suddenly carried on again. Singleblood-corpuscles, too, may frequently be observed hurledby a wave, as it were, against angles of the containingvessels, and remain hanging for a brief interval; at thesetimes they may be seen quivering or oscillating, in spiteof the pressure they must undergo; but their stoppagesare never long, they soon fly off again, or, becoming in-volved in the general stream, they are borne onwards. IntAniiumplating the circulation under these circumstances, abyeciacle of the most interesting kind is presented to the eye: OF THE BLOOD AND CIBCULATION. 213 the little molecules of the blood are seen in ceaseless motionand alive, but altogether without inherent activity, now borneforward as upon gentle waves, and then pushed more im-petuously along; now advancing in serried ranks, nowthreading their way in single files, the entire phenomena de-pendent upon the activity of the central organ. In the mostminute intermediate vessels of all, a great degree of repose is
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Fig 230.—Portion of the lung of a live Triton drawn under the micro-scope, and magnified 150 times; a, 6, c, streams of venous blood; <7, abranch of the pulmonary artery. The very delicate capillaries sen-ing asbonds of union between the pulmonary vessels, are seen playing roundlittle islets of the substance of the lung. The clear space between thecurrent of the blood and the walls of the vessels observed in the largerbranches is almost entirely wanting here. The lymph granules, therefore,are observed mixed with the general torrent. The arrows indicate thecourse of the currents. 214 OP THE BLOOD AXD CIKCULA-TTON. apparent; single streams are often only recognizable by tlieirbounding parietes; comprehended within two dark lines,these vessels are usually filled with the liquor sanguinisalone ; it is at intervals only that a blood-corpuscle, morerarely a lymph-corpuscle, from some neighbouring and largerstreamlet, detaches itself and makes its way into the canal,which till now had a

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