261 



§ 201. The Spur, and the pressure of the Seat- 

 hones of the rider are so related that they must be 

 discussed together. It is scarcely necessary to 

 premise that we do not intend actual use of the 

 spur when the pressure of the leg suffices. The 

 spur, acting near the rear end of the sternum, 

 brings on the action of the posterior winding Hne 

 of its own side ; thus the left spur will induce the 

 developement of the left posterior winding line, 

 first in the "reaction" from the secondary section, 

 then, the "proper" secondary section, then in the 

 primary section (the drawing of the cross line end). 

 It thus reduces the working of the opposite pos- 

 terior line. 



If the left hind-foot have just grounded in the 

 trot, the right posterior line begins to form and 

 put the foot on its inner bearings ; drawing the 

 left rein will interfere with this, by checking the 

 coinciding movement of the left lower jaw articula- 

 tion on to its inner bearing, (temporal muscle 

 setting); and the left spur will also check it by de- 

 veloping the opposite posterior winding-line ; con- 

 sequently the left hind leg, if (as in the right-hand- 

 ed man), it works too much on the inner bearing, 

 will be " bent " or " suppled." 



The Seat-hone pressure affects similar results for 

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