16 HUMBLE CKEATUKES. 



the articulate races — wormSj millipedes^ crustaceanSj 

 aradmidse, and insects^— the central nervous stem 

 traverses the opposite, that is, the ventral side, almost 

 immediately in contact with the outer surface. 



There now remain, to be considered, in. connexion 

 with the natural history of the Earthworm, its organs 

 and mode of reproduction, and also its habits of life, 

 and obvious uses. 



