Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . ^ the power ofits jaws, has been known to gnaw a hole of an inch indiameter in the side of an iron canister in which it hadbeen confined. The rapidity of the movements in insects isalso so great, that the vibrations of the wings in some specieshave been calculated at several hundred, and, in some ofthe smaller insects, at several thousand in a second of time. 461. The various kinds of progression in dif
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . ^ the power ofits jaws, has been known to gnaw a hole of an inch indiameter in the side of an iron canister in which it hadbeen confined. The rapidity of the movements in insects isalso so great, that the vibrations of the wings in some specieshave been calculated at several hundred, and, in some ofthe smaller insects, at several thousand in a second of time. 461. The various kinds of progression in different ani-mals are called swimming, crawling, flying, ivalking, running,jumping, &c. 462. In fishes, the body is propelled through the waterby the tail, on the same jorinciple as a boat in impelled bysculling. The tail being vertical, in most cases its stroke ishorizontal, and the body is propelled forward by the resist-ance of the water to its broad expansion, as it strikes from. Fig. 63.—Tail-Fin of Whale. side to aider by the alternate contraction of the muscleswhich extend from the long process of the vertebrae tothe tail. In the whale, the tail {fig. 63) is expanded hori- What is said of some species of beetle ? What is said of the movementsof insects? What are the various kinds of progression in animals called?How is the body in fishes propelled through the water? How is the strokemade against the water in most cases? What propels the fish? How is thetail expanded in the whale, and how is its stroke made ? What is said of thestructure of the tail ?—of the power of the whale ? ANIMAL MOTION. 227 zontally, so that its stroke is vertical. The texture of thetail is such, that it is insensible to pain, and it is so toughthat it is rarely torn or injured. The whale is thereforecapable of inflicting a tremendous blow without any painto itself, and of cutting a strong boat asunder, or of driv-ing it with the swiftness of an arrow to the depth of manyfathoms.
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