84 . SAVAGE SURVIVALS 



top of another. Here are found the things men 

 have fought with and worked with and lived in 

 objects which have defied the teeth of time, and 

 which endure long after their creators have van- 

 ished. 



It is believed that man originated somewhere 

 in southern Asia. Or, possibly, still further 

 south than the present boundary of Asia, in lands 

 now drowned by the Indian Ocean. This sup- 

 posed land has been called Lemuria. 



5. Changes in Geography. 



You know from your study of physiography 

 that a large part of what is now the land surface 

 of the earth was once the floor of the sea. Sand- 

 stone and limestone, which are so common over 

 the land surfaces, we know, are made under wa- 

 ter, and no place else. And w r e find the fossils of 

 fishes and other water animals scattered all over 

 the land, even to the mountain tops. The remains 

 of a whale were found in northern Mississippi the 

 other day. This animal, when it died, was swim- 

 ming in the Mississippi Sea, a great body of wa- 

 ter which once extended from the Gulf of Mexico 

 over what is now the Great Central Plains of the 

 United States. 



The City of Louisville, Kentucky, is built where 

 it is because the Ohio river has a fall there. This 

 fall is caused by a coral reef running across the 

 river at that point. Corals are sea animals. And 

 the corals that located the city of Louisville by 



