. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. G12 COMPARATIVE PHYSIOLOGY. similar and antagonistic muscles so co-ordinated that the line of gravity falls within the area of the feet. An unconscious animal falls, which is itself an evidence of the truth of the above remarks. The following statements in regard to the direction of the line of gravity in man may prove useful : 1. That for the head falls in front of the occipital articulation, as exemplified by the nodding of the head in a drowsy person occupyin
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. G12 COMPARATIVE PHYSIOLOGY. similar and antagonistic muscles so co-ordinated that the line of gravity falls within the area of the feet. An unconscious animal falls, which is itself an evidence of the truth of the above remarks. The following statements in regard to the direction of the line of gravity in man may prove useful : 1. That for the head falls in front of the occipital articulation, as exemplified by the nodding of the head in a drowsy person occupying the sitting attitudes. That for the head and trunk together passes behind a line joining the centers of the two hip-joints, hence the uncor- rected tendency of the erect body of man is to fall backward. 3. That for the head, trunk, and thighs falls behind the knee- joints somewhat, which would also favor falling backward (bending of the knees). 4. The line of gravity of the whole body passes in front of a line joining the two ankle-joints, so. Fig. 453.—Shows the simaltaneous positions of both legs during a step, divided into four groups" (after Weber). First group (A), 4 to 7, gives the different positions which the legs simultaneously assume while both are on the ground; second group (B), 8 to 11, shows the various positions of both legs at the time when the poste- rior leg is elevated from the ground, but behind the supported one; third group (C), IS to 14, shows the positions which the legs assume when the swinging leg overtakes the standing one; and the fourth group (D), 1 to 3, the positions during the time when the swmging leg is propelled in advance of the resting one. The letters a, 6, and c indicate the angles formed by the bones of the right leg when engaged in making a step; the letters m, % and o, the positions assumed by the right foot when the trunk is rolling over it; g, shows the rotating forward of the trunk upon the left foot (/) as an axis; h, shows
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