53 



The effect of the posterior winding hne on the 

 same articulations, along the convexes, is to turn 

 them inward. 



The reciprocal cross-cutting of these lines in the 

 convexity articulations is the means of their discharge 

 with the spring ivhich they Imve gathered, so soon 

 as it is Hberated. 



§ 56. The double t^sdsting of the convexity ribs 

 may receive and retain the elements of the dis- 

 charge, as produced in them by the diagonal wind- 

 ing lines, before the cui'vatures of the spine are at 

 all affected. 



As was mentioned in § 32, the displacement of 

 the cross-line by the anterior winding line — in this 

 case to the left — brings on a reaction to the poste- 

 rior line from the head, and the rear cross-line 

 end will not draw until a final exertion of the rear 

 "point of application," or a redoubled working of 

 the anterior point (§ 38j restores it to its place. 



§ 57. We should suppose the discharge to take 

 place as follows : 



The left anterior winding line, having estab- 

 lished the light anterior, and left posterior, con- 

 vexes. The posterior line works — with reaction 

 at the head — from the rear of each convex ; and 

 the first effect of this working is to double-twist 

 3* 



