ON THE EXTERNAL CONFORMATION. 25 

 justice. In this position of the leg, a greater por- 

 tion of weight must be thrown on the hough 

 than if it were upright. Moreover, it is clear, tiiat 

 a moving part must be impeded in its action in 

 proportion as it is oppressed, and this oppression 

 is sufficiently manifest by the production of tho- 

 rough pins, curbs, spavins, and weakness in the 

 fetlock joint, commonly called knuckling over ; 

 injuries to which horses of this mould are pecu- 

 liarly subject. 



The foregoing remarks upon the external 

 conformation, apply only to the mechanical 

 advantasjes to be derived from a peculiar con- 

 struction of the component parts. The force 

 of the muscles not being directly proportioned 

 to their bulk, but being in a compound ratio 

 of their size and density or elasticity, the latter 

 not being visible, the force can only be as- 

 certained by experiment, that is, by a trial of 

 the animal. 



Having 



