Ixxviii 



INTRODUCTION. 



/ the leg, formed of the two bones tibia and fibula, h the 

 hock, whereof c is the bone of the heel, u the cannon-bone, 

 with its splint bones g,f the upper pastern, d the lower pas- 

 tern, e the coffin bone, t the sesamoid bones, v the navicular 

 bone, x the hoof. 



This chain of bones being extended, performs the functions 

 of a lever in moving forward the body, the foot fixed to the 

 ground being the fulcrum. In like manner, the other move- 

 ments of the animal are performed by the flexure and exten- 

 sion of the bones, thus - 



==?: 





It is by means of the muscular forces that all the flexure 

 of the bones, and movements of the other parts, are performed. 

 The muscles constitute the greater part of all the solid matter 

 of the body, forming the flesh of the animal, and entering 

 into the composition of vessels, ducts, and sacs within the 



