94 



{b') cannot take full effect until (h) is carried out 

 (§ 37), this movement will be held in abeyance. 



Its secondary section direct action will move the 

 anterior part of the body to the left, and as it 

 brings about whatever action may be equivalent ta 

 putting the right propeller true ribs on their inner 

 bearings, the alteration of the centres of gravity 

 will bring the left hind and right fore-feet still 

 more on their inner bearings. 



At the following combination of the " primary 

 section " of the posterior winding-hne into the 

 " composite spine," which, in this order of succes- 

 sion, would be the final action in forming that 

 spine, the diagonal feet of appuis will be brought 

 strongly upon their inner bearings, and there will 

 be required to resist the passage of the body to- 

 the right, as, reciprocally to the withdrawal of 

 the right socket the left socket rises, a pressure 

 of this latter against the outer edge of the left 

 condyle, and corresponding with the suppressed 

 advance of the socket (see the preceding para- 

 graph), a passage forward, along this edge, to 

 the anterior point, where, finally, a turn to the front 

 and inward by the left socket will discharge the 

 gathering, so soon as the alternate set of motions 

 be inaugurated to release it. 



