The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة xi
... Birds and Man 133 Bird Census of the United States 134 Birds as Seed - Eaters 135 Birds as Grain - Eaters 136 Birds as Insect - Eaters 136 Insect Parasites 138 Rodent Pests 138 Mice 139 Rats 139 Difficulties of Pest Control 140 Effects of ...
... Birds and Man 133 Bird Census of the United States 134 Birds as Seed - Eaters 135 Birds as Grain - Eaters 136 Birds as Insect - Eaters 136 Insect Parasites 138 Rodent Pests 138 Mice 139 Rats 139 Difficulties of Pest Control 140 Effects of ...
الصفحة 26
... birds and flying reptiles Triassic period : rise of dinosaurs Paleozoic Era . Age of Fish Dominance . Permian period : rise of reptiles ; another great ice age Pennsylvanian period : rise of insects and first time of marked coal ...
... birds and flying reptiles Triassic period : rise of dinosaurs Paleozoic Era . Age of Fish Dominance . Permian period : rise of reptiles ; another great ice age Pennsylvanian period : rise of insects and first time of marked coal ...
الصفحة 52
... birds and animals their habits must be adjusted to varying conditions . It is not temperature , as such , which causes the great semiannual migration of birds . Many species that winter in the South could remain in the North if food ...
... birds and animals their habits must be adjusted to varying conditions . It is not temperature , as such , which causes the great semiannual migration of birds . Many species that winter in the South could remain in the North if food ...
الصفحة 54
... birds may be due to differences of growth as between day and night . Influence of Wind The winds , also , have some influence on the distribution of life . They greatly increase the evaporation of water and thus affect the humidity of ...
... birds may be due to differences of growth as between day and night . Influence of Wind The winds , also , have some influence on the distribution of life . They greatly increase the evaporation of water and thus affect the humidity of ...
الصفحة 58
... Birds migrate to find new sources of food . Bears hibernate . There are physiological changes as well as changes in habits . A frog is lively in warm water but becomes sluggish and drowsy as the temperature falls . The blood temperature ...
... Birds migrate to find new sources of food . Bears hibernate . There are physiological changes as well as changes in habits . A frog is lively in warm water but becomes sluggish and drowsy as the temperature falls . The blood temperature ...
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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