122 PRIMEVAL MAN. 



opinion, be explained, except by violent and 

 sudden action since or during the period of 

 their entombment. Great caves, packed closely 

 from floor to roof with the bones of the 

 Hippopotamus and Rhinoceros ; other caves, 

 equally full of the bones of extinct Oxen, 

 are proofs of some diluvial action of which 

 Man has had no experience in historic times. 

 But, even allowing for the greater activity of 

 geological causes, the time required for such 

 changes of climate has in all probability been 

 very great. And when we consider that 

 many of these evidences of Geology apply to 

 the New World as well as to the Old, we can- 

 not fail to see that the proofs of a very high 

 antiquity for the Human Race are proofs of 

 a cumulative character, gathered along several 



