Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 68 OKGASIZATIOX AND DEVELOPMENT Ol? ANIMALS LN acid (and water). The exchange of these two gases between the blood and the external medium is the essential part of the respiratory process, and is effected through organs which are suited for carry in'1 on this process either in air or in water. In the simplest cases the exchange of these two gases takes place through the genera] surface of the body; and in all cases, ev
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 68 OKGASIZATIOX AND DEVELOPMENT Ol? ANIMALS LN acid (and water). The exchange of these two gases between the blood and the external medium is the essential part of the respiratory process, and is effected through organs which are suited for carry in'1 on this process either in air or in water. In the simplest cases the exchange of these two gases takes place through the genera] surface of the body; and in all cases, even when special respira- tory organs are present, the outer skin abo takes part in respiration.
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