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horse might shirk by backing on this foot — but the 

 rider by bringing down his right seat-bone and 

 partly inducing the right anterior line prevents it. 

 Now, the action of the left spur forming the left 

 posterior line up to its primary section, should, in 

 connection with the pressure of the right side of 

 the bit which checks its thrust, carry the left hind- 

 foot to the right, across the central line of the 

 body. The pressure of the left rein carried agaiast 

 the neck convex, while tending to produce the alter- 

 nate curve in its left posterior line component, 

 should, by the primary section of this Hne, carry 

 the left fore-foot, related to the neck as the left 

 hind-foot is to the body, in the same direction, viz., 

 to the right — and this pressure on the neck affect- 

 ing the whole length of the spine, forces the horse, 

 if he have resisted, to yield to the foregoiag action 

 of the left spur. 



Under the actions of the left spur, left rein and 

 right seat-bone, the alternate winding lines have 

 nearly suppressed the left-right counteraction, but 

 the head condyles have not been allowed to change. 

 This counteraction is now restored, and being 

 stiQ held in check, as to its forward thrust, by the 

 left side of the bit, the rotary elements of the 

 secondary section of the anterior line, on the light- 



