The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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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 alone survive our winters . There are no very small mam- mals in very cold lands . Too much of their food would have to be used to maintain bodily temperature . We LIFE , ITS NATURE AND DISTRIBUTION 51.
... few of them will produce seed , let alone survive our winters . There are no very small mam- mals in very cold lands . Too much of their food would 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 ...
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عبارات ومصطلحات مألوفة
acres Africa alloy America appears areas Asia atoms average bacteria birds black bass body carbon carbon dioxide cattle cause cells Cenozoic cent century changes chemical chlorophyll climate coal common compounds crops cultivated culture death rate destroy disease distribution domestic animals early earth eaten eggs elements enemies Europe evidence fact fish forms germ germ cells hawk heat horse human hydrogen Ibid important increase Indian insects iron killed known land later light live man's metals mice migration miles moth native nature neolithic nitrogen ocean organisms oxygen Pará rubber tree parasites plants and animals population pounds produce protoplasm R. S. LULL race regions rodents season seeds seems sharp-shinned hawk sheep soil South South America species square mile substances sugar supply surface survive tarpan temperature thousand tion to-day trees tropics types United wild