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Updated: May 11, 2025
And throughout he observed, with a curious sense of detachment, the furious beating of the wings, almost useless in the thin air, and the expansion and contraction of sac-like membranes on each side of the necks which he took to be auxiliary lungs. It was the girl's action that brought Chet to his senses.
The ovum of a tape-worm, getting into its natural habitat, the intestine, unfolds into the well-known form of its parent; but if carried, as it frequently is, into other parts of the system, it becomes a sac-like creature, called by naturalists the Echinococcus a creature so extremely different from the tape-worm in aspect and structure, that only after careful investigations has it been proved to have the same origin.
The chief organs concerned in the work of respiration are *The Lungs.*—The lungs consist of two sac-like bodies suspended in the thoracic cavity, and occupying all the space not taken up by the heart. They are not simple sacs, however, but are separated into numerous divisions, as follows: 1.
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