The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
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الصفحة 46
... larvæ to penetrate the earth , cocoons from which the new form comes , hibernation for bears , migration for birds , while every rotten log or hollow tree literally teems with dormant life . " The animal lives in an environment which is ...
... larvæ to penetrate the earth , cocoons from which the new form comes , hibernation for bears , migration for birds , while every rotten log or hollow tree literally teems with dormant life . " The animal lives in an environment which is ...
الصفحة 62
... " are not only licked by their hosts ( first step ) , but are also fed regularly from their mouths ( second step ) , and finally also the larvæ of these beetles are reared by the ants like their own brood 62 THE PHYSICAL BASIS OF SOCIETY.
... " are not only licked by their hosts ( first step ) , but are also fed regularly from their mouths ( second step ) , and finally also the larvæ of these beetles are reared by the ants like their own brood 62 THE PHYSICAL BASIS OF SOCIETY.
الصفحة 74
... larvæ of the corn - root worm feed upon the roots of young corn and sometimes cause the loss of the entire field . This worm and a few similar species probably destroy two per cent of the crop year by year . The ear worm eats the ...
... larvæ of the corn - root worm feed upon the roots of young corn and sometimes cause the loss of the entire field . This worm and a few similar species probably destroy two per cent of the crop year by year . The ear worm eats the ...
الصفحة 78
... larvæ a day , while the yellow - throated warbler will consume 10,000 tree lice in the same time . A scarlet tanager has been known to devour 35 gypsy moths a minute for 18 minutes . More than 50 different species feed upon caterpillars ...
... larvæ a day , while the yellow - throated warbler will consume 10,000 tree lice in the same time . A scarlet tanager has been known to devour 35 gypsy moths a minute for 18 minutes . More than 50 different species feed upon caterpillars ...
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acre Africa America appeared Asia average bacteria beetles believe birds body breeding carbon carbon dioxid carnivora cattle cause cent century changes characters chromosomes civilization climate color considered crops cultivated Darwin death destroyed discovered discoveries disease early earth eggs elements elm-leaf beetle environment Europe European evidence evolution existence fact favorable feeble-minded female fish forms germ cells groups growth hence heredity Hessian fly human Ibid important Inasmuch inches increase individuals influence inheritance insects Kallikak Family killed known Lamarck large numbers larvæ less living lower malaria male man's mated natural selection nature normal organisms ovum oxygen parents physical plants and animals population possible produced race reason seeds smallpox social society soil species square mile substances survive temperature theory thought tion trees tropics tuberculosis United women yellow yellow fever