289 



action above alluded to, being absent in artificial 

 wings, may have something to do with the poor 

 success attending all attempts to adapt them to 

 the human frame. 



Possibly the reversed positions of the head and 

 sockets of the rib articulations in the snake to 

 those in the higher animals, may be accounted for 

 by the discharge in the S S, being successive, for 

 the former, but combined for the latter. 



