54 



the ribs on the rear posterior halves of the con- 

 vexes, and change their outer to an inner bearing 



(§ 51). 



This being done, the final movement draws the 

 posterior end of the cross-line and anterior termi- 

 nation of the right posterior winding line [which 

 results in the outward turn to the rear of the right 

 hemisphere of the head socket (§ h, § 39, etc.),] so 

 into place, that the winding lines cut each other 

 through the anterior halves of the convexes, also 

 changing the inner bearing of their ribs to an 

 outer one. The discharge is thus virtually com- 

 pleted, and the body in position for the alternate 

 gathering, if the alternate anterior point of appli- 

 cation come at once into play. 



§ 58. The posterior halves of the convexes, 

 being virtually discharged by the complete draw- 

 ing — although not the cutting — of the lines, are 

 thus actually discharged ; the 'posterior, when the 

 posterior cross-line end receives the full traction 

 of the posterior winding line ; the anterior, when 

 the alternate anterior point of application begins 

 its working. Or, perhaps, rather the whole dis- 

 charge is only virtual, until this last action occurs, 

 when the actual discharge and spring rai3idly 



