742 



PHYSIOLOGY OF THE DOMESTIC ANIMALS. 



the limb, passing now into flexion, again describes its forward pendulum 

 motion, the point of support of the scapula being the centre of rotation, 

 while the hoof describes an arc of a circle. On the other hand, while 



Fig. 303.— Oscillation of the Flexed Fore Leg. (Colin.) 



The hoof describes an arc of a circle, CM .1, the cord, C A. being a measure of the extent of oscillation. 



the foot is on the ground the shoulder describes the arc of a circle and 

 the centre of rotation is in the foot. The combination of these two 

 movements in both fore legs is seen in Fig. 305. 



Fig. 304.— Oscillation of the Extended Fore Leg. (Colin.) 



The foot being on the ground at D, the shoulder describes an arc of a circle, A B C. 



Ill the case of the hind leg flexion likewise results in a shortening 

 of the axis of the leg and the reduction of the angles between the dif- 

 ferent bones. The weight being thrown on the opposite extremity by 



