On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 371
... widely , as in the case of certain powerfully - winged birds , will necessarily range widely ; for we should never forget that to range widely implies not only the power of crossing barriers , but the more important power of being ...
... widely , as in the case of certain powerfully - winged birds , will necessarily range widely ; for we should never forget that to range widely implies not only the power of crossing barriers , but the more important power of being ...
Página 372
... widely it ranges . The relations just discussed , namely , lower organisms ranging more widely than the higher , some of the species of widely - ranging genera themselves ranging widely , -such facts , as alpine , lacustrine , and marsh ...
... widely it ranges . The relations just discussed , namely , lower organisms ranging more widely than the higher , some of the species of widely - ranging genera themselves ranging widely , -such facts , as alpine , lacustrine , and marsh ...
Página 388
... widely sundered in the natural system . But this resemblance is confined to general appearance , as in the prominence of the canines , and in the cutting shape of the molar teeth . For the teeth really differ much : thus the dog has on ...
... widely sundered in the natural system . But this resemblance is confined to general appearance , as in the prominence of the canines , and in the cutting shape of the molar teeth . For the teeth really differ much : thus the dog has on ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young