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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149 페이지
... extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities of extinct be- ings , which , though generally ...
... extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities of extinct be- ings , which , though generally ...
150 페이지
... extinction , will , for a long period , continue to increase . But which groups will ultimately prevail , no man can ... extinct , and leave no modi- fied descendants ; and consequently that , of the species living at any one period ...
... extinction , will , for a long period , continue to increase . But which groups will ultimately prevail , no man can ... extinct , and leave no modi- fied descendants ; and consequently that , of the species living at any one period ...
162 페이지
... extinct species . At each period of growth all the growing twigs have tried to branch out on all sides , and to overtop and kill the surrounding twigs and branches , in the same manner as species and groups of species have at all times ...
... extinct species . At each period of growth all the growing twigs have tried to branch out on all sides , and to overtop and kill the surrounding twigs and branches , in the same manner as species and groups of species have at all times ...
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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