. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. now ANLMALS BKEATHE. 115 little sacs coiniected to- gether by tubes; in Spi- ders and Scorpions, the spiracles, usually four in number, are the mouths of sacs without the tubes, and the interior of the sac is gathered into folds ; land Snails have one spiracle, or aperture, on the left side of the neck, leading to a large cavity, or sac, lined with fine blood-vessels. These sacs represent the primi- tive idea of a lung, which is but an infolding of the skin, divided up into cells, and covered with capil
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. now ANLMALS BKEATHE. 115 little sacs coiniected to- gether by tubes; in Spi- ders and Scorpions, the spiracles, usually four in number, are the mouths of sacs without the tubes, and the interior of the sac is gathered into folds ; land Snails have one spiracle, or aperture, on the left side of the neck, leading to a large cavity, or sac, lined with fine blood-vessels. These sacs represent the primi- tive idea of a lung, which is but an infolding of the skin, divided up into cells, and covered with capillary ; Like the alimentary canal, the lungs of an animal are really an inflected portion of the outer surface; so that. tiii(ni_li I Inoiitlu il tube. Lung i)f I Bird, m i^iutitd «, the c i\ity b, Its lining incmbi m ^ buppoiting blood- vessels c, peifoiation'^ at the oiihcet. of the lobular passages, d; e, interlobular spaces, containing the termiual branches of the pulmonary vessels supplying the capillary plexus, /, to the meshes of which the air gets access by the lobular Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Orton, James, 1830-1877. New York, Harper and brothers
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
