46 PRIMARY FACTORS OF ORGANIC EVOLUTION. 



O 



U d 



o 



O 



B 



as 

 c 



o Cfq 

 C C 



r 



o 

 B 



0,, 



3 



■5; 





^ 



ri .n ri n ri 



? 8 



S tN 



°s' 



N t^ 



