. Animal physiology. Physiology, Comparative; Physiology, Comparative. 142 RECEPTION OF FLUIDS. the cuttle-fish tribe (Fig. 85) ; and the similar organs of the polypes (Fig. 1). 173. The reception of fluids is accomplished in two ways. Sometimes the liquid is made to fall into the mouth, simply by its own weight; in other instances it is drawn or pumped up by this cavity,—either by the expansion of the chest, which causes a rush of air towards the lungs,—or by the movement of the tongue, which, being drawn back like a piston, produces the action of sucking. Some of the lower animals are destin
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 142 RECEPTION OF FLUIDS. the cuttle-fish tribe (Fig. 85) ; and the similar organs of the polypes (Fig. 1). 173. The reception of fluids is accomplished in two ways. Sometimes the liquid is made to fall into the mouth, simply by its own weight; in other instances it is drawn or pumped up by this cavity,—either by the expansion of the chest, which causes a rush of air towards the lungs,—or by the movement of the tongue, which, being drawn back like a piston, produces the action of sucking. Some of the lower animals are destined to be entirely sup- ported by liquids which they find in plants, or which they draw from the bodies of other animals on which they live as parasites. This is the case with many insects; and their mouth, instead of pre- & « sen ting the ordinary structure, is formed into a sort of tube or trunk, very much extended, through which the juices are drawn up accord- ing to the wants of the animal. Such a conforma- tion exists in the butterfly and moth tribe, whose trunk, when not in use, is coiled up in a spiral beneath the head ; as is shown in Fig. 87, re- presenting the head of a Butterfly, a, of which the eye is seen at c, the base of the antennae at b, the palpi at e, and the trunk at d. In some of the Fly tribe, the trunk attains a length several times greater than that of the body, as shown in Fig. 88, representing a di- pterous (two-winged) insect from the Cape of Good Hope, which sucks the juices of a single kind of flower, the length of whose tube just equals that of its long Chimpanzee 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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