. The comparative physiology of respiratory mechanisms. Respiration. 138 RESPIRATORY MECHANISMS In special experiments it was shown that the compressibility of the tracheal system, including the air sacs, is so slight that an efficient ventilation is not within the power of the animal, and the air sacs can function, in so far as they have any respiratory significance, only as an oxygen Fig. 80. Donatio, larvae and pupae on Ranunculus roots (see text). About natural size. (Boving.) While the respiratory mechanism of the Mansonia larva ap- pears simple and reasonably clear, the same cann
. The comparative physiology of respiratory mechanisms. Respiration. 138 RESPIRATORY MECHANISMS In special experiments it was shown that the compressibility of the tracheal system, including the air sacs, is so slight that an efficient ventilation is not within the power of the animal, and the air sacs can function, in so far as they have any respiratory significance, only as an oxygen Fig. 80. Donatio, larvae and pupae on Ranunculus roots (see text). About natural size. (Boving.) While the respiratory mechanism of the Mansonia larva ap- pears simple and reasonably clear, the same cannot be said of the Donacia larvae. These animals, shown in Fig. 80 on the roots of Ranunculus from which they feed, possess in connec- tion with each of the last abdominal spiracles a slightly bent very sharp chitin thorn (89 cy) which is inserted into the root (86 bq).. 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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