INTRODUCTION. 11 



find we have only to study the hock-joint in the 

 trot. The first order is seen in the hock in the trot 

 after the foot has been lifted from the ground. To 

 bring it quickly to the ground we find the fulcrum 

 at the true hock-joint, XhQ power attached behind to 

 the point of the hock, and the weight to be moved, 

 are all the parts below the hock, including, of course, 

 the foot. 



To illustrate our lever of the second order, take 

 the hock in the trot when the foot is placed on the 

 ground. AVe now find the fulcrum and weight have 

 changed places, but the power is still as in the first 

 order behind the hock. The foot being planted on 

 the ground is now the seat of the fdcriim, or fixed 

 point, and the iveight is the whole of the body which 

 is thrown on to the true hock-joint, and is the 

 obstacle to be overcome, and is being lifted and 

 pushed forward. 



Lastly, our lever of the third order is seen in the 

 hock during the trot, when the hind leg is left be- 

 hind after pushing the body forward, and has to be 

 lifted and pulled forward before it can again be 

 brought forward under the body, (this is the same 

 action, and better seen, when the hind foot is being 

 lifted to knock off a fly that is irritating the bell}-)* 

 the front power is now acting, and the weight and 

 fulcrum are the same as in the example of the third 

 order, or in other words, the power is in the middle. 



Summarising what has been said of the three 

 orders of lever as exemplified by the hock-joint in 



