The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for LifeWerner Company, Book Manufacturers, 1900 - 538페이지 |
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118 페이지
... continued preservation of all the individuals which presented slight deviations of struc- ture mutually favourable to each other . I am well aware that this doctrine of natural selec- tion , exemplified in the above imaginary instances ...
... continued preservation of all the individuals which presented slight deviations of struc- ture mutually favourable to each other . I am well aware that this doctrine of natural selec- tion , exemplified in the above imaginary instances ...
188 페이지
... continued amount of variability , which has continually been accumulated by natural selection for the benefit of the species . But as the variability of the extraordinarily developed part or organ has been so great and long - continued ...
... continued amount of variability , which has continually been accumulated by natural selection for the benefit of the species . But as the variability of the extraordinarily developed part or organ has been so great and long - continued ...
310 페이지
... continued preservation of the individuals of some extinct high - reaching ruminant , which had the longest necks , legs , & c . , and could browse a little above the average height , and the continued de- struction of those which could ...
... continued preservation of the individuals of some extinct high - reaching ruminant , which had the longest necks , legs , & c . , and could browse a little above the average height , and the continued de- struction of those which could ...
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adapted advantage allied 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 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 improved increase individuals 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 Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young