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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 8

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6. soft and have no portions of a horny nature such as hairs, nails or scales. It exerts both perspiratory and respiratory action to an extreme degree; in fact a frog kept dry by the hot sun will die; and life can be sustained under water by skin respiration, with no aid whatever from the lungs. For this reason the skin is most abundantly supplied with blood vessels from the anterior division of the pulmo-cutaneous artery which is one of the three trunks leading from the heart. [underlined] Plate I [/underlined] - shows an injected portion of the skin from the ventral side of the frog. Very minute blood vessels form
 
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