Archive image from page 456 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 Bibio febrilis (fg. 236), the foot is furnished with three suckers, in the Musca domestica with two (Jig. 237), and in the Cymbex Lutea with five. Numerous other species, amongst which is the common Wasp, are fur- nished with cushions and analogous suckers, which enable them to ascend vertically on glass. The predaceous insects run with great velo- city in proportion to their height. Those which are furnished with very short legs must ad- vance them at interva
Archive image from page 456 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 Bibio febrilis (fg. 236), the foot is furnished with three suckers, in the Musca domestica with two (Jig. 237), and in the Cymbex Lutea with five. Numerous other species, amongst which is the common Wasp, are fur- nished with cushions and analogous suckers, which enable them to ascend vertically on glass. The predaceous insects run with great velo- city in proportion to their height. Those which are furnished with very short legs must ad- vance them at intervals of time corresponding to the square roots of their length, on the supposition that their legs are subject to the same physical laws as those of the human race. Mr. Delisle observed a minute fly run three inches in half a second, making 540 steps in the same time ; each of these steps 3 must have been consequently -- = of an inch in length. The great number of steps taken by these minute animals conveys to the mind of the observer an impression that the animal is running, whereas it is merely walking, the body not swinging freely in the air, as is necessary, according to the definition of Weber, to constitute the act of running. Myriapoda. — In the Myriapods, the great number of legs and the celerity of their move- ments, as for example, in the Scolopendra, render it difficult to detect the order of their motions. The numerous segments entering into the lengthened form of the trunk, each of which is furnished with a pair of legs, give to the body great flexibility, and enable the Myriapods to turn from a right line to any curved or angular path, or to pass over rough surfaces with facility. The legs, in number from fourteen to forty-two, are short, and directed laterally ; they are composed of four segments ; all the joints, except that by which they are attached to the trunk, arc ginglymoid, and terminate in a sharp conical claw, which gives precision and security
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