89 



ian or snake movements on the ribs, another set 

 of movements, namely, that on the hinder limbs, 

 to be accommodated, and on this set again, in 

 order to provide for the master movement of the 

 fore-limbs — earned to its perfection in man — there 

 is yet another set of movements to be accommo- 

 dated, namely, that on these fore-limbs and on the 

 lower jaw. 



It is with reference to these requirements that 

 we should explain the necessity for a complete S 

 in the neck, added to the couple of extra vertebrae 

 used in the snake ; and, in dividing the vertebrae 

 for this purpose, ice should place the one or two ver- 

 tehrce ansivering to the snake's neck, directly under 

 the seventh vertebra of the neck (§ 82), ivhere they, 

 aided by the general motion of the part, form a vie- 

 TUAL hall and socket joint. 



The separate motions of the trunk and of the 

 hmbs may, we think, be easily noticed in the 

 horse, and, indeed, Seeger, a Pi-ussian author, 

 in his " Horsemanship," insists much upon mark- 

 ing it. " First the body moves, then the limbs." 



§ 91. In the chest of the higher animals, as has 

 already been noticed, the ribs have great mobility 

 and large development below, while at the ex- 

 treme top they have Ktfcle of either. It is appar- 



