Human physiology (Volume 2) . re regarded as the agents of exhalation. All this is, how-ever, conjectural. It has already been observed, that the mesen-teric veins have been considered by some to terminate by openmouths in the villi of the intestines; and the same arrangementhas been conceived to prevail with regard to other veins. Ribes 1 Muller, op. cit. p. 211. b Krause, in Mullers Archiv. Heft. 1, 1837; and Brit, and For. Med. Rev., July,1838, p. 218 ; also, Henle, Allgemeine Anatomie, S. 176, Leipz. 1841. c See, on this subject, Wilbrand, Physiologie des Menschen, s. Kap. xxviii. andxxix.
Human physiology (Volume 2) . re regarded as the agents of exhalation. All this is, how-ever, conjectural. It has already been observed, that the mesen-teric veins have been considered by some to terminate by openmouths in the villi of the intestines; and the same arrangementhas been conceived to prevail with regard to other veins. Ribes 1 Muller, op. cit. p. 211. b Krause, in Mullers Archiv. Heft. 1, 1837; and Brit, and For. Med. Rev., July,1838, p. 218 ; also, Henle, Allgemeine Anatomie, S. 176, Leipz. 1841. c See, on this subject, Wilbrand, Physiologie des Menschen, s. Kap. xxviii. andxxix. Leipz. 1840. <i Vasor. Lymph. Corpor. Human. Histor., Sen. 1817 ; and Prodromo della GrandeAnatomie, Firenz. 1819. « Opera., Lond. 1687. f Opera., Lugd. Bat. 1722. 84 ClKClLATION. concludes, from the results of injecting the veins, that some of thevenous capillaries are immediately continuous with the minutearteries, whilst others open into the cells of the laminated tissue,and into the substance of the ditferent Ramifications of the Splenic Artery in the Spleen. When the veins become visible,they appear as an infinite numberof tubes, extremely small, and communicating very freely witheach other; so as to form a very fine network. These vesselsgradually become larger and less numerous, but still preserve theirreticular arrangement; until, ultimately, all the veins of the bodyempty themselves into the heart, by three trunks — the vena cavainferior, the vena cava superior, and the coronary vein. Thefirst of these receives the veins from the lower part of the body,and extends from the fourth lumbar vertebra to the right auricle;the second receives all the veins of the upper part of the body ;and into it the subclavian opens, into which the chyle and lymph CIRCULATORY APPARATUS. 85 are discharged. It extends from the cartilage of the first rib tothe right auricle. The coronary vein belongs to the heart exclu-sively. Between the superior and inferior cava a communica
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