94 



MODERN IDEAS OF EVOLUTION 



of causes, some of which we can conjecture, but the 

 greater part of which are still hidden from us, and 

 are only partially and inaccurately presented to us 



TABULAR VIEW OF GEOLOGICAL PERIODS AND OF 

 LIFE-EPOCHS. 



by any scheme of evolution yet proposed. If in the 

 table above we were to represent diagrammatically 



