170 



lines bring the hind and fore-feet on their inner 

 bearings. In the bicomposite spine this beariQg is 

 increased, and the whole body brought iato one 

 gathering with two convexes, upward, in the me- 

 dian perpendicular plane ; i. e., one consisting of 

 the neck and part of the ophidian spine, the other 

 of part of the ophidian spine and the third S ; the 

 centre of the ophidian spine sinking as a concave 

 between them.* 



A' A'. Eelease the gathered springs of all the 

 spines successively before leaving the ground, and 

 beguirdng with the ophidian spine. The hind-feet 

 are thus released first, and the fore-feet imme- 

 diately after them. The release of the fore-feet 

 by the alternate neck lines — which in the single 

 action trot would have been accomphshed after 

 the landing — is in the double action accompanied 

 by a sudden and rapid carrying of them forward, 

 at the time when the head condyles change their 

 bearing. 



The feet come down gathered on the anterior 

 lines, and immediately form on B' B', and so on. 



§ 154. At one moment of the " double trot " 

 the horse is much extended, the fore-feet being 



* Here again wo have the centre between the hmg lobes as the 

 " centre of force" for the whole body (§ 99). 



