The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
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الصفحة 46
... eggs to hatch the next year , 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 ...
... eggs to hatch the next year , 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 ...
الصفحة 58
... eggs . Some indeed depend more directly upon plants . Certain leaf - eating beetles are aquatic in their early stages . They have no gills , but attach them- selves to plants from which they get a direct supply of oxygen even under the ...
... eggs . Some indeed depend more directly upon plants . Certain leaf - eating beetles are aquatic in their early stages . They have no gills , but attach them- selves to plants from which they get a direct supply of oxygen even under the ...
الصفحة 63
... eggs of plant lice with their nests during the winter . The sanguinary robber ant occupies herself almost exclusively with hunting , and leaves the cultivation of plant lice to her slaves . " The hunting ants of Africa are accompanied ...
... eggs of plant lice with their nests during the winter . The sanguinary robber ant occupies herself almost exclusively with hunting , and leaves the cultivation of plant lice to her slaves . " The hunting ants of Africa are accompanied ...
الصفحة 71
... eggs , are represented next year by another pair of the same species , and no more : that is , out of 500 eggs , producing 500 caterpillars , 498 are de- stroyed in some way . . . . The important thing is that a species abundant in ...
... eggs , are represented next year by another pair of the same species , and no more : that is , out of 500 eggs , producing 500 caterpillars , 498 are de- stroyed in some way . . . . The important thing is that a species abundant in ...
الصفحة 73
... egg to adult and the progeny of a single pair may reach in a season 134 million . For some years it attracted ... eggs being deposited in the unripe boll which is de- stroyed as the insect develops . It hibernates in cotton stalks ...
... egg to adult and the progeny of a single pair may reach in a season 134 million . For some years it attracted ... eggs being deposited in the unripe boll which is de- stroyed as the insect develops . It hibernates in cotton stalks ...
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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