The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 3
... trees , got glimpses of them but we do not know what he thought about them . At some far later time the " watchman upon the mountain tops , " " the shepherds keeping watch over their flocks by night , " began the careful observations ...
... trees , got glimpses of them but we do not know what he thought about them . At some far later time the " watchman upon the mountain tops , " " the shepherds keeping watch over their flocks by night , " began the careful observations ...
الصفحة 47
... trees in Louisiana may be draped in Spanish moss . In the desert , moisture is conserved in the fleshy leaves of cactus or , as in other cases , the roots of the shrubs extend a considerable distance about the plant and are near the ...
... trees in Louisiana may be draped in Spanish moss . In the desert , moisture is conserved in the fleshy leaves of cactus or , as in other cases , the roots of the shrubs extend a considerable distance about the plant and are near the ...
الصفحة 50
... trees or eat the poisonous plants passed by under normal conditions . Horses will scrape away three feet of snow to get at grass , while the cattle perish . The blizzard may bring death to thousands of sheep . The deer will be more ...
... trees or eat the poisonous plants passed by under normal conditions . Horses will scrape away three feet of snow to get at grass , while the cattle perish . The blizzard may bring death to thousands of sheep . The deer will be more ...
الصفحة 54
... tree will appreciate the action of the wind . Exposure to or protection from various winds decidedly affects the value of land for agriculture . Farmers in Nebraska have often seen a promising field of corn or oats ruined in a day by a ...
... tree will appreciate the action of the wind . Exposure to or protection from various winds decidedly affects the value of land for agriculture . Farmers in Nebraska have often seen a promising field of corn or oats ruined in a day by a ...
الصفحة 56
... trees . Stone cutters , coal- miners , men who work in the dust of the streets , breathe in so much foreign matter that their lungs are coated , and they are made susceptible to the attacks of germ diseases if 56 THE PHYSICAL BASIS OF ...
... trees . Stone cutters , coal- miners , men who work in the dust of the streets , breathe in so much foreign matter that their lungs are coated , and they are made susceptible to the attacks of germ diseases if 56 THE PHYSICAL BASIS OF ...
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acres Africa America appears areas Asia atoms average bacteria believe birds body carbon carbon dioxide cause cent century cephalic index changes characters chromosomes civilization climate color common copper crops cultivated culture danger Darwin death rate destroy disease domestic early earth eggs environment Europe European evidence fact feeble-minded females fish forms germ cells given heredity human Ibid important increase Indians individual inheritance insane insects iron killed known land later light living male man's marriage metals miles natural selection nature Negro neolithic organisms ovum oxygen Pará rubber tree parasites physical population possible pounds present problems produced R. S. LULL race seeds seems social South South America species square mile supply T. H. MORGAN temperature things thousand tion to-day trees tropics types United wild woman women