. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 300 THE MECHANICAL FUNCTIONS. In insects destined to move in water, sometimes all the legs, but occasionally only one pair, are lengthened and expanded into broad triangular surfaces, capable of acting as oars; and these surfaces are farther extended by the addition of marginal fringes of hair, so disposed as to project and act upon the water every time the impulse is given, but to bend down when the leg is again drawn up, preparatory to the succeeding strok
. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. 300 THE MECHANICAL FUNCTIONS. In insects destined to move in water, sometimes all the legs, but occasionally only one pair, are lengthened and expanded into broad triangular surfaces, capable of acting as oars; and these surfaces are farther extended by the addition of marginal fringes of hair, so disposed as to project and act upon the water every time the impulse is given, but to bend down when the leg is again drawn up, preparatory to the succeeding stroke; thus imitating the action which is called feathering an oar. The impulses are given with great regu- larity, all the feet striking the water at the same 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 Roget, Peter Mark, 1779-1869. London : W. Pickering
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