. The comparative physiology of respiratory mechanisms. Respiration. c. Fig. 6. First instar larva of Omorgus in Polytoma culture. B, after 7 min.; C, after 10 min.; and D, after 15 min. A, after 6 min. (Thorpe.) In a very large number of forms belonging to all major groups some oxygen is absorbed through the skin and C02 is eliminated, generally in even larger amount. When there is a tension difference, as is practically always the case, and when the integument is permeable, some gas exchange is unavoid- able and all gradations are found between, this gas exchange being respectively essential
. The comparative physiology of respiratory mechanisms. Respiration. c. Fig. 6. First instar larva of Omorgus in Polytoma culture. B, after 7 min.; C, after 10 min.; and D, after 15 min. A, after 6 min. (Thorpe.) In a very large number of forms belonging to all major groups some oxygen is absorbed through the skin and C02 is eliminated, generally in even larger amount. When there is a tension difference, as is practically always the case, and when the integument is permeable, some gas exchange is unavoid- able and all gradations are found between, this gas exchange being respectively essential or negligible in the economy of the animal. The accessory cutaneous respiration in certain animals will be discussed below (p. 54). Specific respiratory organs show a specially enlarged surface in contact with the external medium through which more. 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 Krogh, August, 1874-1949. Philadelphia, University of Pennsylvania press
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