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 353
... Various special difficulties also remain to be solved ; for instance , the occurrence , as shown by Dr. Hooker , of the same plants at points so enormously remote as Kerguelen Land , New Zealand , and Fuegia ; but icebergs , as ...
... Various special difficulties also remain to be solved ; for instance , the occurrence , as shown by Dr. Hooker , of the same plants at points so enormously remote as Kerguelen Land , New Zealand , and Fuegia ; but icebergs , as ...
Página 393
... various ways and degrees , to all the species ; and they will consequently be related to each other by circuitous lines of affinity of various lengths ( as may be seen in the diagrams so often referred to ) , mounting up through many ...
... various ways and degrees , to all the species ; and they will consequently be related to each other by circuitous lines of affinity of various lengths ( as may be seen in the diagrams so often referred to ) , mounting up through many ...
Página 408
... various transformations , Fritz Müller has suggested that the process of slowly modifying and adapting an animal to live on the land or in fresh water , instead of in the sea , would be greatly simplified by its not passing through any ...
... various transformations , Fritz Müller has suggested that the process of slowly modifying and adapting an animal to live on the land or in fresh water , instead of in the sea , would be greatly simplified by its not passing through any ...
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