XI 



MAN'S FIRST CONSTRUCTED HOME 



North America, having gradually emerged from 

 the water, had come into existence. To the east of 

 Alaska, the warm Atlantic currents had become re- 

 stricted by the rising land and did not flow so 

 freely as formerly. To the south, the Seward Pen- 

 insula was forming, first appearing as a string of 

 islands with shoals, then gradually rising more and 

 more, until it restricted the ocean currents from the 

 Pacific. The Arctic regions, being deprived of their 

 warming influences, were beginning to feel the cold 

 of winter. 



The birds had taken the warning and were com- 

 mencing to form their migratory habits by flying 

 south to escape the cold and to find regions where 

 their food supply was more abundant, returning 

 north each summer to their earlier homes for the 

 nesting season. The mammoth had also appar- 

 ently tried to make its escape, but had perished in 

 large numbers in the region of Escholtz Bay, at a 

 section often called the Mammoth Graveyard. The 

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