WHEN THE WORLD WAS YOUNG 195 



in the new red sandstone, could have looked but little 

 different from our friends of to-day. 1 



It is an established fact that large animals more 

 quickly become extinct than small ones. Their families 

 are fewer, to begin with, and they need more food and 

 water ; it is also more difficult for them to hide, and to 

 escape from their enemies. For these reasons, among 

 others, vast hordes of huge monsters have died out, and 

 given place to smaller ones, both in land and sea. And 

 no doubt, if the world goes on long enough, other changes 

 will take place ; the old order of things will be swept 

 away, and men will some day be puzzling over the 

 skeletons of cats and the bones of canary birds. 



1 From Owen's Paleontology ; Manual of Paleontology, by 

 Nicholson and Lyddeker, and Hutchinson's Extinct Monsters. 



02 



