The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
من داخل الكتاب
الصفحة xi
... 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 Bird Destruction 140 Unsatisfactory Remedies 141 Rabbits 142 ...
... 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 Bird Destruction 140 Unsatisfactory Remedies 141 Rabbits 142 ...
الصفحة 45
... seeds , and exist indefinitely under dry condi- tions , but reproduction will occur only where it is moist . The bulk of them are to be found , then , in water or moist earth but since they are so small and light large numbers exist at ...
... seeds , and exist indefinitely under dry condi- tions , but reproduction will occur only where it is moist . The bulk of them are to be found , then , in water or moist earth but since they are so small and light large numbers exist at ...
الصفحة 47
... seed must occur when the rainy season is on or reproduction may be prevented . When man appears and tries to cultivate this dry country he comes to appreciate the old saying : Little drops of water On little grains of sand Make a mighty ...
... seed must occur when the rainy season is on or reproduction may be prevented . When man appears and tries to cultivate this dry country he comes to appreciate the old saying : Little drops of water On little grains of sand Make a mighty ...
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.
الصفحة 52
... seed ere the period of rest appears , which means the dry times in the tropics and the winters elsewhere . Since plants and seed mean food to birds and animals their habits must be adjusted to varying conditions . It is not temperature ...
... seed ere the period of rest appears , which means the dry times in the tropics and the winters elsewhere . Since plants and seed mean food to birds and animals their habits must be adjusted to varying conditions . It is not temperature ...
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
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