. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 281 RESPIRATION. surface is destitute of cilia. Fig. 234. In the frog, as in of the internal lining. It is a curious fact which forms a thin pavement coating. This that the exterior of the lung should be desti- ~p ' •'• • " "" * ' " tute of cilia, while they should be present on that of the liver in the newt. They are, how- ever, on this last organ, limited to the margins Nothing is more easy than to exhibit the living circulation in the lung of the newt. The Fig. A. small piece coinciding with
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 281 RESPIRATION. surface is destitute of cilia. Fig. 234. In the frog, as in of the internal lining. It is a curious fact which forms a thin pavement coating. This that the exterior of the lung should be desti- ~p ' •'• • " "" * ' " tute of cilia, while they should be present on that of the liver in the newt. They are, how- ever, on this last organ, limited to the margins Nothing is more easy than to exhibit the living circulation in the lung of the newt. The Fig. A. small piece coinciding with the true capillary or respiratory area from the lung of the Newt, viewed by transmitted light tinder a high power. The blood-corpuscles in streams are seen in the spaces between the islets a, a, a. Only these parts are in focus. The hyaline epithelium covering the near face of the picture is out of sight. The eye looks beyond it. In this fresh uninjected state the blood- channels' do not appear to be bounded by separate and independent parietes. (Original.) a, a, a, are parenchymatous islets occupying the meshes of the capillary rete. They are composed of cells carrying nuclei and granules. internal bore of the vessel viewed by trans- mitted light is much greater than the long diameter of the red corpuscles. The meshes (ff, ») are mere points. The scene is one thick, rich, surpassingly beautiful network of moving blood. In the frogs and toads the lungs consist of two large, short, and broad,slightly cancellated shining bags. They are situated on either side of the spine, at the roof of the abdominal cavity. They are remarkably elastic, like those of the newt. They are capable of slowly expelling their contents even after the removal of the abdominal walls, and of draw- ing themselves up into little hard balls on either side of the pharynx. They exhibit well the living circulation. The glottidean aperture communicates directly with the interior of the organ. There is, th
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