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 xxvi
... amount of modification which living beings have undergone during geological time is but very small in relation to the whole series of changes which they have suffered . " In December , 1859 , Dr. Hooker published his ' Intro- duction to ...
... amount of modification which living beings have undergone during geological time is but very small in relation to the whole series of changes which they have suffered . " In December , 1859 , Dr. Hooker published his ' Intro- duction to ...
Página 4
... amount of hereditary modification is at least possible ; and , what is equally or more important , we shall see how great is the power of man in accumulating by his Selection successive slight variations . I will then pass on to the ...
... amount of hereditary modification is at least possible ; and , what is equally or more important , we shall see how great is the power of man in accumulating by his Selection successive slight variations . I will then pass on to the ...
Página 8
... amount of variation ; and that , when the organisation has once begun to vary , it generally continues varying for many generations . No case is on record of a variable organism ceasing to vary under cultivation . Our oldest cultivated ...
... amount of variation ; and that , when the organisation has once begun to vary , it generally continues varying for many generations . No case is on record of a variable organism ceasing to vary under cultivation . Our oldest cultivated ...
Página 9
... amount of food , colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause ...
... amount of food , colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause ...
Página 19
... amount of difference in our do- mesticated races . In attempting to estimate the amount of structural difference between allied domestic races , we are soon involved in doubt , from not knowing whether they are descended from one or ...
... amount of difference in our do- mesticated races . In attempting to estimate the amount of structural difference between allied domestic races , we are soon involved in doubt , from not knowing whether they are descended from one or ...
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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