137 



far as tlie spring is concerned, before them) their 

 appui, the hind-leg, jprecedes in leaving the ground, 

 the appui of the anterior C C, the diagonal fore-leg,"^ 

 the latter being in great part used only as a rest 

 while collecting the spring and in Hfting the anter- 

 ior part of the body. It is discharged only when 

 the whole composite S springs from the ground. 



The posterior winding line prepares the dis- 

 charge of both C C on the already formed anterior 

 line, but its working is not completed until the 

 posterior "point of appUcation " has brought the 

 posterior end of the cross-line to its own side, as 

 the anterior point of appHcation has already 

 brought the anterior end. This cannot be done 

 until the anterior end, which holds it in check 

 (§ 32) is completely hberated, consequently not 

 until after the liberation of the spring from the 

 hind-foot, where the direct drawing of the posterior 

 point of application on the posterior cross-line end 

 completes— first, the change of curvature in the anterior 

 C, lifting up tJw fore foot, and then, completing the 

 change of curvature in the posterior C, puts down the 



* In our usual illustration, the parts would be the left anterior and 

 right posterior points of application, the left hind and right lore legs, 

 and the cross-line would be, at first, drawn completely over to the left 

 side, the anterior end being drawn, and the posterior end held in check 

 there by the left anterior winding line. 



