40 ON THE ORIGIN AND [CHAP. 



Campodea type, has been modified by the conditions 

 under which it lives. The external forces acting 

 upon it are different from those which affect the 

 mature form ; and thus changes are produced in 

 the young which have reference to its immediate 

 wants, rather than to its final form. 



And, lastly, as a consequence, that metamorphoses 

 may be divided into two kinds, developmental and 

 adaptional or adaptive. 



