218 



tion (§167), and, therefore, not with its representa- 

 tive, the rear point of the (left) eye muscle ; and, 

 as we cannot develope the secondary section of 

 the alternate posterior line without some corres- 

 ponding point d'appni, in the old line, we take 

 the right upper ribs as this point d'appui, and 

 begin by forming against it, the secondary section 

 of the alternate (left) posterior winding Hne ; first 

 in its " reflected " action of drawing the inner bear- 

 ing from the (left) false to the (right) false rib ar- 

 ticulation ; and, then, in its " proper " action from 

 the (right) true to the (left) true ribs. 



It will be remembered (§171), that the move- 

 ment of every point is, now, the reverse of what 

 it was in the forcing of the old Hne. 



We shall make the description of this movement 

 in more general terms than have been employed 

 heretofore. 



In the composite spine. First. — Pressing the upper 

 part of the (right) upper ribs forward and to the 

 (left), an appui is taken on that action in the 

 course of the alternate (left) posterior line, which 

 will, for the secondary section (by reaction), draw 

 the inner bearing from the (left) false ribs to the 

 right ones, then (by proper action), that of the 

 right true ribs to the left ones, and begin to fill the 



