143 



In the same way, the shoulders receive all the 

 diagonal actions. 



In giving the details of the trot, which we are 

 about to do, we have followed out each section of 

 the winding lines as if it were developed in each of 

 the spines — ophidian, composite, and bi-compo- 

 site — in succession, before the succeeding section 

 began in the ophidian spine. This has been done 

 to avoid the confusion from intermixing them ; 

 but it is obvious that the ball and socket motion of 

 the neck cannot succeed the anterior line of the 

 ophidian spine smoothly until the primary section 

 of the latter is partially formed, since this latter 

 moves the neck-root joint. Hence, the ophidian 

 and composite S S of the trot are always in ad- 

 vance of the neck S — that is to say, both their 

 secondary and primary windmg-line sections are 

 in formation before the secondary of the neck 

 begins. 



§ 140. It may be mentioned that we shall con- 

 sider THE TROT as formed by commencing icith the 

 ophidian S, and through the continuance of the 

 action of this S developing the other S S, and, fi- 

 nally, the bi-composite spine ; the pace as com- 

 mencing tvith the neck S, which, by its develop- 

 ment, causes the formation, — first, of the third S, 



