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 vii
... structures variable - Parts developed in an unusual manner are highly variable ; specific characters more variable than ... structure with changed functions- Widely different organs in members of the same class , de- veloped from one and ...
... structures variable - Parts developed in an unusual manner are highly variable ; specific characters more variable than ... structure with changed functions- Widely different organs in members of the same class , de- veloped from one and ...
Página 3
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one limited sense , as we shall here ...
... structure and coadaptation which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one limited sense , as we shall here ...
Página 9
... structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure , whether extremely slight or strongly ...
... structure so strongly pronounced as to deserve to be called monstrosities arise ; but monstrosities cannot be separated by any distinct line from slighter variations . All such changes of structure , whether extremely slight or strongly ...
Página 14
... structure , owing to the mysterious laws of correlation . The results of the various , unknown , or but dimly understood laws of variation are infinitely complex and diversified . It is well worth while carefully to study the several ...
... structure , owing to the mysterious laws of correlation . The results of the various , unknown , or but dimly understood laws of variation are infinitely complex and diversified . It is well worth while carefully to study the several ...
Página 17
... structure , in such case , I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view : to assert that we could not breed our cart and race - horses ...
... structure , in such case , I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view : to assert that we could not breed our cart and race - horses ...
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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