212 



Third. — As the head joint sockets begin their 

 equahzation at the forward ends, the shoulder- 

 joints would equalize as representing the second- 

 ary section of the posterior line action, in the 

 bicomposite spine ; but the " reflected action " 

 which takes place in the hinder-Hmbs must first be 

 carried out by their equalization on the inner 

 bearing ; then succeeds the similar equahzation of 

 the shoulder-joints ; next, for the composite spine, 

 comes that of the false ribs, then of the true ribs, 

 and the filUng of the (left) upper lung lobe, from 

 the left lower ; finally, the equalizing of this section 

 in the ophidian S. 



Fourth. — The head joint sockets equalize on their 

 outer edges ; the lower jaw articulations follow, 

 bringing on the equahzation of the posterior cross- 

 line ends in succession ; the lower end of the 

 sternum and the small of the back for the compos- 

 ite S ; the working between the upper and lower 

 lung lobes for the ophidian. 



§ 170. It will be observed that the lower jaiv ar- 

 ticulations go with the posterior C C in each ca^e ; the 

 shoulder-blades tvith the anterior C G ; that is, the 

 lower jatv goes tvith the secondary section of the an- 

 terior lines, and, with the primary section of the poste- 

 rior, whilethe shoulder-blades go with the secondary sec- 

 tions of the posterior, and the primary of the anterior. 



