The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
من داخل الكتاب
الصفحة 47
... birds will , if their nests are 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 ...
... birds will , if their nests are 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 ...
الصفحة 62
... birds . Squirrels often carry walnuts , chestnuts and acorns con- siderable distances . Many seeds like burdock or cockle- burs catch in the hair of passing animals and are thus transported to new locations . Every observer has in ...
... birds . Squirrels often carry walnuts , chestnuts and acorns con- siderable distances . Many seeds like burdock or cockle- burs catch in the hair of passing animals and are thus transported to new locations . Every observer has in ...
الصفحة 63
... birds as cowbirds in America or the herons which accompany the herds of buffalo in Africa . Here these companions either feed on the parasites of their four- footed friends or take advantage of the insects attracted by their presence or ...
... birds as cowbirds in America or the herons which accompany the herds of buffalo in Africa . Here these companions either feed on the parasites of their four- footed friends or take advantage of the insects attracted by their presence or ...
الصفحة 65
... bird of prey , or a ' fit of gladness , ' which bursts out when the animals are in good health and especially when young , or merely the desire of giving play to an excess of impressions and vital power - the necessity of communicating ...
... bird of prey , or a ' fit of gladness , ' which bursts out when the animals are in good health and especially when young , or merely the desire of giving play to an excess of impressions and vital power - the necessity of communicating ...
الصفحة 66
... birds that one thought the surface moved when they took wing . He has seen prairie chickens leaving the wheat stubble of Dakota by the hundreds and has watched in early spring great companies engaged in lovemaking . Birds ordinarily ...
... birds that one thought the surface moved when they took wing . He has seen prairie chickens leaving the wheat stubble of Dakota by the hundreds and has watched in early spring great companies engaged in lovemaking . Birds ordinarily ...
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
acre Africa America appeared Asia Australoid average bacteria basis become believe birds body brain breeding carbon carbon dioxid carbonic acid cause cent century cephalic index changes characters child chromosomes civilization climate color considered Darwin death destroyed disease early earth eggs elements environment Europe European evidence evolution existence fact families favorable feeble-minded female forms genius germ cells groups growth hair hemophilia hence heredity human Ibid Inasmuch inches increase individuals influence inheritance insane insects institutions Kallikak Family known Lamarck large numbers larvæ less living male man's mated ment mental nature Negro normal organisms ovum oxygen parents physical plants and animals population possible problems produced race relatively seems smallpox social society soil species spermatozoon square mile survive temperature thought tion tropics tuberculosis United woman women yellow yellow fever