99 



Jja. front the shoulder-blades are attached to the 

 'breast-bone and to the front of the ribs by large 

 and powerful muscles, and the breast-bone being 

 joined to the head by the stemo-mastoid muscles, 

 there is, in this way, Si front attachment of the 

 shoulder-blades to the head. The massiveness 

 of these connections agrees with the function of 

 the fore-limbs as the final brace on which all the 

 gatherings are collected. 



§ 98. In the horse the breast muscles suffice for 

 the connection in front ; but in man the collar-bones 

 are added. These are articulated, each at one 

 end, with an upper corner of the breast-bone, and 

 at the other end with one of the shoulder-blades. 



The breast-bone of man is thus enabled to ptish 

 against the arm-bones, as well as, like that of the 

 horse, to draw upon them ; and the head of man 

 being, during the working of the condyles, thus 

 braced against the " substitute ground " (§ 82), by 

 the collar-bones, as the head of the horse is 

 against the real ground, by its fore-legs, the sup- 

 porting thrust is transmitted to the pelvis, and in 

 this way the legs of a man can act both as com- 

 plete "supporters" and complete "propellers." 



§ 99. Thus, frst, the intermediate appui of the 

 action of the neck is the sternum, on which the 



