10 



THE BONES. 



are each divisible into four principal regions : the shoulder, applied against the 

 front part of the thorax ; the arm, which succeeds the shoulder ; and the fore- 



SKELETON OF THE HORSE. 



arm, and foot. The posfprior limbs also comprise four regions : the haunch or 



pelvis, which articulates with the posterior part of the spine : and the thigh, leg, 



and posterior foot. 



Fig. 6. 



SKELETON OF THE COW. 



In Birds, the posterior limbs alone assume the function of columns of support. 

 The thoracic limbs, formed for flight, constitute the wings. 



