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The Histology of the Common Frog by Rose B. Ankeny, 1887

The Histology of the Common Frog by Rose B. Ankeny Edgar, 1887, Page 14

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12. importance perhaps than the skin, and alone, are not sufficient for the maintenance of life. The action, however is the same as in any lung: oxygen is supplied to the blood and and carbon-dioxide is carried off from it. [underlined] Plate V [/underlined] representing a portion of the lung injected, showed the large air cells, indicated by the large divisions, and which, in the natural specimen can be distinguished with the unaided eye. Distributed through the walls of these air cells is a network of extremely minute bloodvessels. Pigment cells
 
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