211 



may, perliaps,be moTe advantageously carried out 

 on the pacing movement than on that of the trot 

 just described. If we begin with the anterior lines 

 of the bicomposite spine, i. e., the pace in progression, 

 the successive motions would be as follows : 



First. — The movement of the (left) head condyle 

 equalizing with the right at its posterior end, 

 brings on the equahzation of the lower jaw articu- 

 lations, the (right) articulation being brought 

 (§ 166) with a sort of lateral epicycloidal movement 

 over the (left) ; thence the movement extends to the 

 equalization of the hind-limbs on the outer bearing; 

 thence, passing more inward to the equalization of 

 the secondary section of the anterior line in the 

 composite spine, viz., the pelvis, the false ribs, the 

 filling of the (right) lower lung lobe; the secondary 

 section in the ophidian spine bringing the action 

 between the upper and lower lung lobes. 



Second. — The equalization of the shoulder-blades 

 on the outer bearings as the head condyles equalize 

 on their cross joint movement, brings on the equal- 

 ization of the other primary sections in the succes- 

 sive spines. The sternum comers and the small 

 of the back are effected by the anterior cross-lines 

 of the composite spine, and, finally, the equaliza- 

 tion of these end between the upper and lower 

 lung lobes. 



