THE FORE EXTREMITY. 65 



are very ninrierous, it will be useless to describe the 

 origin and insertion of each muscle, but by the aid 

 of diagrams we can see these living levers to greater 

 advantage. I will, however, draw your special 

 attention to two things. First, you ought to get a 

 mental picture of this Fig. 8, E, in order that you 

 may be able to recognise it as seen in the living 

 horse, covered, however, by the skin. Secondly, 

 please to notice that all the parts from just above 

 the ' knee' are made up of the bellies or contracting 

 parts of the muscles with hardly any visible tendon, 

 but that from just above the knee to the foot all is 

 tendon and bone together, not a single helly of 

 muscle. Perhaps there is' a third point you had 

 better notice, namely, that of the bulky fleshy part, 

 the greatest bulk is at the back of the shoulder 

 blade and arm bone, the shoulder getting more and 

 more bulky as it descends. Look steadily first at 

 the column of bones unclothed until you can see 

 them in your mind's eye through their fleshy cloth- 

 ing, because I give you warning that we are now 

 going to represent all we have got to say further by 

 straight bare lines only. 



54. — Before going any further, we must revert to 

 the dry subject of levers. Let me impress upon you 

 this universal law, that power and speed are always 

 related to each other, but that this relation is always 

 antagonistic. Expressed in other words it is this, 

 ' if you gain power you lose speed,' which is only 

 saying, of course, that ' if you gain speed you lose 

 power.' This universal law does a great deal for 



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