ON THE THEORY OF EVOLUTION. 



127 



-I:? 





1 ^. ( Exact repetition .^ 



acceUrahon, \ Modified repetition I 



which proceeds by ] g^^^^^^^pyj - 



retardation^ j Exact atrophy ^ 



Avhich proceeds by ( Inexact atrophy (or senility r-' ^j. 



as 



o Si: 





P 



t< 



O Co 



s 2. 



Co i_l 



* 

 * 



a, a 

 O £1 



t-b 05 



* So called by Prof. Hyatt. 



