The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página xviii
... follows : - " All species might have been varieties once , and many va- rieties are gradually becoming species by assuming con- stant and peculiar characters ; " but farther on ( p . 18 ) he adds , " except the original types or ...
... follows : - " All species might have been varieties once , and many va- rieties are gradually becoming species by assuming con- stant and peculiar characters ; " but farther on ( p . 18 ) he adds , " except the original types or ...
Página xx
... follows : - " The archetypal idea was manifested in the flesh under diverse such modifications , upon this planet , long prior to the existence of those animal species that actually exemplify it . To what natural laws or secondary ...
... follows : - " The archetypal idea was manifested in the flesh under diverse such modifications , upon this planet , long prior to the existence of those animal species that actually exemplify it . To what natural laws or secondary ...
Página 5
... follows from the high geo- metrical ratio of their increase , will be considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can ...
... follows from the high geo- metrical ratio of their increase , will be considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can ...
Página 10
... follows from the crossing of distinct species , and that which may be observed with plants and ani- mals when reared under new or unnatural condi- tions . Many facts clearly show how eminently sus- ceptible the reproductive system is to ...
... follows from the crossing of distinct species , and that which may be observed with plants and ani- mals when reared under new or unnatural condi- tions . Many facts clearly show how eminently sus- ceptible the reproductive system is to ...
Página 36
... follow it as a trade : the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at intervals of months , and the sheep are each time marked and classed , so that the very best may ...
... follow it as a trade : the sheep are placed on a table and are studied , like a picture by a connoisseur ; this is done three times at intervals of months , and the sheep are each time marked and classed , so that the very best may ...
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Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young