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"The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity."
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"The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity."
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"For the source of any characteristic so widespread and uniform as this adaptation to environment we must go back to the very beginning of the human race."
Beginning
"The human organism inherits so delicate an adjustment to climate that, in spite of man's boasted ability to live anywhere, the strain of the frozen North eliminates the more nervous and active types of mind."
Ability
"The geysers and hot springs of the Yellowstone are another proof of recent volcanic activity."
Geology
"America is the last great goal of these migrations."
Goal
"The Indians could not undertake any widespread cultivation of the plains not only because they lacked iron tools but also because they had no draft animals."
Animals
"Surprising as it may seem, this study indicates that similar conditions are best for all sorts of races."
Diversity
"From first to last the civilization of America has been bound up with its physical environment."
Civilization
"Thus the races, though alike in their physical response to climate, may possibly be different in their mental response because they have approached America by different paths."
Diversity
"It seems strange that almost no other traces of the strong vikings are found in America."
Exploration
"The evidence points to central Asia as man's original home, for the general movement of human migrations has been outward from that region and not inward."
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