73 



simple S S curves. We have selected the third result, 

 not that it is the animal's usual way of halting, 

 but, that it is the one important for our purpose. 



§ 75. To retake diagonal gathering from the 

 shape of " superimposition of twists," or, as it might 

 be termed, " double diagonal- gathering," it will not 

 be necessary to repeat the diagonal workings of 

 counter-action, for, since both gatherings are now 

 present, the yielding of their lines of traction by 

 one pair of forces to the other, or the overcoming 

 of one pair of forces by the other, will restore the 

 one-pair gathering on the shghtest movement of 

 the head. 



§76. The "Third Kesult" will form the basis 

 of the system of Setting-up. 



§ 77. It should seem that the perfect locomotive 

 actions of all animals are directed by the eyes. 



"Whether the eyes lead these actions, or only 

 form a pivot for them, the steady point of every 

 movement centres on the eye-pupil. It is necessary, 

 therefore, that these poles of all the described 

 cui'ves should be freed fi'om the necessity of ac- 

 companying any particular part in its movements. 

 Such freedom is obtained partly by the appropria- 

 * tion of two or three vertebrae to form a neck, and 

 partly by an independent discharge of the real or 



