Mainsprings of Civilization |
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activity agriculture American animals appears Asia atmospheric electricity average Babylonia biological biological inheritance Caspian Sea cent century China cities civilization climatic cycles climatic efficiency cold contrast countries crops cultural curve deathrate desert diet diseases effect electrical Encyclopædia Britannica England especially Europe evidence example fact factor favorable Figure geographical Germany groups Hakkas heredity human Huntington Iceland increase India indicate influence innate Japan Junkers kind kiths land latitudes less library circulation living maximum mental migration Mongols mountains Nevertheless Newfoundland nomads North northern optimum ozone Parsis percentage period physical environment population progress Puritans qualities race rain rainfall regions relatively religion reproduction Russia season seems selection shows similar social solar solar constant South southern stimulating storms summer sunspots temperament temperature tend tion trees tropical tropical air United vigor warm weather winter York