ON THE THEORY OF EVOLUTION. 



127 







■*^ I— ( 





Is, 



»* § in- S 



s-^S o a 



"5 "^ r* ■^^ 



g ^ "■ ~ 

 g ^"o Sri 



, ^. ( Exact repetition ^ 



acederahon, ) Modified repetition : 



which proceeds by | g^^^,.^t^py| -^ 



retardation, \ Exact atrophy ^ 



which proceeds by ( Inexact atrophy (or senilityr * 



* 

 * 



* So called by Prof. Hyatt. 



