260 



trot, the pressure of the bit on the left side of the 

 mouth will increase the formation on the outer 

 bearing, and if continued after the right posterior 

 line has begun to develope, will more or less hinder 

 the formation on the inner bearing wliich this re- 

 quires. If applied exactly after the spring from 

 the left hind-leg, it will hinder the completion of 

 the alternate (right) anterior line in the bicompos- 

 ite spine, § 111 (since it is the opposite side of the 

 jaw which must then take an outer bearing), and 

 so check the progression. Its eifects, we suppose, 

 may always be calculated for the " working side " 

 of the jaw by its coincidence with, or opposition 

 to the movements of the lower jaw, as these coincide 

 with the winding line in progress of development ; 

 and, for the unengaged side, by the effect it thence 

 produces in favoring or hindering the movements 

 of the working side. 



In double action, drawing on the bit favors all 

 the anterior winding lines, and hinders aU the pos- 

 terior ones, excepting just at the interchange of 

 condyles on the spring, when hindering the pos- 

 terior winding lines checks the formation of the 

 alternate anterior ones.* 



* The movement of the jaw, it will be remembered, from its connec- 

 tion with the digastrics and their conneption with the lungs, permeates 

 the whole body. 



