. Animal locomotion : the Muybridge work at the University of Pennsylvania : the method and the result. Muybridge, Eadweard, 1830-1904; Horses; Animal locomotion; Photography, Instantaneous. 128 A STUDY OF SOME arrows in Fig. 20, which, like Fig. 19, is the result of superim- posed tracings of the individual pictures. The arm extended, and the hand and fingers contracted, describe a circle in front of the body. Tlie hand sweeps upward and inward, passes the face, sweeps upward and outward, then downward, and then inward again to its original position. At the same time that this spasm of the le
. Animal locomotion : the Muybridge work at the University of Pennsylvania : the method and the result. Muybridge, Eadweard, 1830-1904; Horses; Animal locomotion; Photography, Instantaneous. 128 A STUDY OF SOME arrows in Fig. 20, which, like Fig. 19, is the result of superim- posed tracings of the individual pictures. The arm extended, and the hand and fingers contracted, describe a circle in front of the body. Tlie hand sweeps upward and inward, passes the face, sweeps upward and outward, then downward, and then inward again to its original position. At the same time that this spasm of the left arm is taking place the right arm, too, becomes convulsed. (Vide Fig. 20.) It is raised abruptly, and the forearm directed upward, and a series of to-and-fro movements commence, and which examination shows are synchronous with the rotary movement of the opposite limb. As the rotating limb rises, the right arm rises; as the former de- scends, the latter descends. As the left arm sweeps inward and upward, the right arm steadily ascends ; as the left arm goes out- ward and downward, the right arm steadily descends. There is certainly here a curious association of movement. If, instead of raising the arm to the shoulder, Mr. C. simply sharply flexes the left forearm at the time it is rotating, as in Fig. 21, a series of to-aud-fro movements replace the rotary movements. (J^de third series, Plate 557, and Fig. 21.) That is, the left arm is thrown violently backward and for- ward. At the same time the right arm becomes similarly affected, and it, too, is thrown violently backward and forward. As in the previous experiment, the move- ments are found to be synchronous. It will be observed that at no time does the right hand become contracted and the fingers " ; Some idea may be gained of the rapid- ity of these movements when we reflect that the complete cycle of the movement represented in Fig. 19 occu- pied less than .47 part of a second, while in Fig. 20 the rapi
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