The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
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الصفحة xii
... destroyed the struggle for existence on which progress depends ? Is civilization destroying itself ? Does social evolution unfavorably affect pop- ulation ? Need of new ideals . X. SOCIAL INSTITUTIONS • · Belief and knowledge . The rise ...
... destroyed the struggle for existence on which progress depends ? Is civilization destroying itself ? Does social evolution unfavorably affect pop- ulation ? Need of new ideals . X. SOCIAL INSTITUTIONS • · Belief and knowledge . The rise ...
الصفحة 15
... destroyed . A similar change may be noted among the animals . Lizards and snakes gradually disappear along with the thick - skinned but practically hairless elephants and hippo- potami . In their stead wolves , bears and fur - bearing ...
... destroyed . A similar change may be noted among the animals . Lizards and snakes gradually disappear along with the thick - skinned but practically hairless elephants and hippo- potami . In their stead wolves , bears and fur - bearing ...
الصفحة 18
... destroy crops and wash the soil . Fog may bring little precipitation , but may produce many of the same effects and be very helpful , while dew prevents freezing ofttimes and also furnishes moisture . Granted then an adequate rainfall ...
... destroy crops and wash the soil . Fog may bring little precipitation , but may produce many of the same effects and be very helpful , while dew prevents freezing ofttimes and also furnishes moisture . Granted then an adequate rainfall ...
الصفحة 25
... Salt Lake . If the streams are polluted with acids , coal , dirt and filth , the fish soon leave or perish . The fumes from a smelter may destroy vegetation . Stone cutters , coal miners , painters and EARTH AND MAN 25.
... Salt Lake . If the streams are polluted with acids , coal , dirt and filth , the fish soon leave or perish . The fumes from a smelter may destroy vegetation . Stone cutters , coal miners , painters and EARTH AND MAN 25.
الصفحة 47
... destroyed , frequently build late in the season in trees . Ducks and geese that are hunted become extremely wary , but will quickly discover and frequent in large numbers a lake where shooting is pro- hibited . In parts of Africa ...
... destroyed , frequently build late in the season in trees . Ducks and geese that are hunted become extremely wary , but will quickly discover and frequent in large numbers a lake where shooting is pro- hibited . In parts of Africa ...
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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