The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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النتائج 1-5 من 13
الصفحة xi
... Moth 130 Scale Insects 131 Crop Damage by Insects 132 Methods of Attack on Enemy Insects 133 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 ...
... Moth 130 Scale Insects 131 Crop Damage by Insects 132 Methods of Attack on Enemy Insects 133 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 ...
الصفحة 53
... moth Cave . Many of the bacteria , especially those which live as parasites in the bodies of animals are quickly killed by exposure to the sunlight . Few germs survive in the bright sunlight of arid regions . Animals vary in their re ...
... moth Cave . Many of the bacteria , especially those which live as parasites in the bodies of animals are quickly killed by exposure to the sunlight . Few germs survive in the bright sunlight of arid regions . Animals vary in their re ...
الصفحة 54
... moths which find difficulty in traveling against the wind . The gypsy moth has traveled northeast from the infection center in eastern Massachusetts more rapidly than it has gone southwest . Any one who has seen the streets of a mid ...
... moths which find difficulty in traveling against the wind . The gypsy moth has traveled northeast from the infection center in eastern Massachusetts more rapidly than it has gone southwest . Any one who has seen the streets of a mid ...
الصفحة 97
... moth . The fig industry of California was made possible by the importation in 1900 of an insect which fer- tilizes the blossoms of the Smyrna figs . Many animals besides man assist in the distribution of plants . Seeds are dropped by ...
... moth . The fig industry of California was made possible by the importation in 1900 of an insect which fer- tilizes the blossoms of the Smyrna figs . Many animals besides man assist in the distribution of plants . Seeds are dropped by ...
الصفحة 100
... moths , pro- ducing say 500 eggs , are represented next year by another pair of the same species , and no more : that is , out of 500 eggs , pro- ducing 500 caterpillars , 498 are destroyed in some way . . . . The important thing is ...
... moths , pro- ducing say 500 eggs , are represented next year by another pair of the same species , and no more : that is , out of 500 eggs , pro- ducing 500 caterpillars , 498 are destroyed in some way . . . . The important thing is ...
المحتوى
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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