The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 168
... plant in the West Indies where the better grasses do not grow . In recent years the Pará rubber tree of Brazil has become very useful . We may realize the situation better , perhaps , if we recall that our chief food plants are wheat ...
... plant in the West Indies where the better grasses do not grow . In recent years the Pará rubber tree of Brazil has become very useful . We may realize the situation better , perhaps , if we recall that our chief food plants are wheat ...
الصفحة 173
... plants which produce rubber but the best is the Pará rubber tree of Brazil . From that country 2,671 tons of raw rubber were exported in 1860 and 38,200 in 1910. Up to 1900 wild plants were the source of supply but by this time the ...
... plants which produce rubber but the best is the Pará rubber tree of Brazil . From that country 2,671 tons of raw rubber were exported in 1860 and 38,200 in 1910. Up to 1900 wild plants were the source of supply but by this time the ...
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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