. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. d trees, however lofty, on which they feed, and to reascend by the same means, without the necessity of taking a circuitous route, and encountering the inequalities of the trunk and branches. In like manner the Caterpillars of the Cabbage-butterfly weave a ladder of silk on the plane of a glass-window, which serves as a fulcrum for its legs, and thus enables the animal to ascend. Perfect Insects.—The order in which the legs of the Hexapods move in walking or running has been accurately explained by Professor Muller. Whil
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. d trees, however lofty, on which they feed, and to reascend by the same means, without the necessity of taking a circuitous route, and encountering the inequalities of the trunk and branches. In like manner the Caterpillars of the Cabbage-butterfly weave a ladder of silk on the plane of a glass-window, which serves as a fulcrum for its legs, and thus enables the animal to ascend. Perfect Insects.—The order in which the legs of the Hexapods move in walking or running has been accurately explained by Professor Muller. Whilst watching insects which move slowly, he observed that three of their legs were always moving at the same time; these were advanced and put to the ground, whilst the other three propelled the body of the insect forwards. The feet, which moved simultaneously, were the fore and hindmost foot on one side, and the middle foot of the opposite side; then the fore and hind foot on this side, and the middle one of the other side, so that in two steps all the six feet are set in motion.* In the first movement, whilst the legs, 1, 2', 3, (Jig. 235) Fig. remain on some solid to support the body, and project it forwards, the other three legs, 1,' 2, 3', are raised and advanced ; then, whilst the legs, ]', 2, 3' are, in their turn, supporting the body, 1, 2', 3 are raised and advanced, and so on alternately. It will be observed, that the base of support in these movements is a triangular plane, with the three feet placed on the three angles; the base and apex of the triangle alternating at each alternate movement of each set of legs; so that in the first move- ment, the apex, which is at 2, takes the oppo- site side at 2' in the second step. The Hexa- pods are supported by their three pairs of legs, and the stability of the animal is increased by the horizontal direction of the legs outward, this arrangement affording a larger base for the support of the centre of gravity. The fir
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