The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 26
... land floras Ordovician period : first known fresh water fishes Cambrian period : first abundance of marine animals and dominance of trilobites Proterozoic Era . Age of Invertebrate Dominance An early and a late ice age . Archeozoic Era ...
... land floras Ordovician period : first known fresh water fishes Cambrian period : first abundance of marine animals and dominance of trilobites Proterozoic Era . Age of Invertebrate Dominance An early and a late ice age . Archeozoic Era ...
الصفحة 42
... land and water surfaces to the heat of the sun creates the two climates which we call marine and continental . Seasonal changes are much less marked on the ocean than on land . The extremes of temperature are much greater on con ...
... land and water surfaces to the heat of the sun creates the two climates which we call marine and continental . Seasonal changes are much less marked on the ocean than on land . The extremes of temperature are much greater on con ...
الصفحة 47
... land where " there is no more scenery than in a pan of skimmed milk . " He crosses mountain ranges and sees little patches of scraggly juniper and wonders if some wag is responsible for calling them " forest reserves . " The open spaces ...
... land where " there is no more scenery than in a pan of skimmed milk . " He crosses mountain ranges and sees little patches of scraggly juniper and wonders if some wag is responsible for calling them " forest reserves . " The open spaces ...
الصفحة 48
Carl Kelsey. may beat down and destroy the crops and wash the land . Fog may bring little precipitation but may be very helpful by preventing transpiration , while dew often prevents freez- ing . As we go from the equator to the poles we ...
Carl Kelsey. may beat down and destroy the crops and wash the land . Fog may bring little precipitation but may be very helpful by preventing transpiration , while dew often prevents freez- ing . As we go from the equator to the poles we ...
الصفحة 51
... few of them will produce seed , let There are no very small mam- Too much of their food would alone survive our winters . mals in very cold lands . have to be used to maintain bodily temperature . We LIFE , ITS NATURE AND DISTRIBUTION 51.
... few of them will produce seed , let There are no very small mam- Too much of their food would alone survive our winters . mals in very cold lands . have to be used to maintain bodily temperature . We LIFE , ITS NATURE AND DISTRIBUTION 51.
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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