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 313
... ancient a form is , by so much the more it tends to connect by some of its characters groups now widely separated ... ancient progenitor . On the principle of the continued tendency to divergence of character , which was formerly ...
... ancient a form is , by so much the more it tends to connect by some of its characters groups now widely separated ... ancient progenitor . On the principle of the continued tendency to divergence of character , which was formerly ...
Página 325
... ancient a form is , the more often it stands in some degree intermediate between groups now distinct ; for the more ancient a form is , the more nearly it will be related to , and consequently resemble , the common progenitor of groups ...
... ancient a form is , the more often it stands in some degree intermediate between groups now distinct ; for the more ancient a form is , the more nearly it will be related to , and consequently resemble , the common progenitor of groups ...
Página 410
... ancient progenitor of the group , we can see why ancient and extinct forms so often resemble in their adult state the embryos of existing species of the same class . Agassiz believes this to be a universal law of nature ; and we may ...
... ancient progenitor of the group , we can see why ancient and extinct forms so often resemble in their adult state the embryos of existing species of the same class . Agassiz believes this to be a universal law of nature ; and we may ...
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