170 PRIMEVAL MAN. 



have they come ? What could have tempted, 

 or what change compelled, a tribe of men 

 to leave the fine regions of the North, to 

 travel down the Cordillera, or backbone of 

 America, to invent and build canoes which 

 are not used by the tribes of Chili, Peru, and 

 Brazil, and then to enter on one of the most 

 inhospitable countries within the limits of the 

 globe?"* There can be but one explanation. 

 Quarrels and wars between tribe and tribe, 

 induced by the mere increase of numbers 

 and the consequent pressure on the means of 

 subsistence, have been always, ever since Man 

 existed, driving the weaker races farther and 

 farther from the older settlements of man- 

 kind. And when the ultimate points of the 



* Darwin's " Naturalist's Voyage," ed. 1852, p. 216. 



