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 179
... Mivart has remarked , that it has little value . I know of no case better adapted to show the impor- tance of the laws of correlation and variation , inde- pendently of utility and therefore of natural selection , than that of the ...
... Mivart has remarked , that it has little value . I know of no case better adapted to show the impor- tance of the laws of correlation and variation , inde- pendently of utility and therefore of natural selection , than that of the ...
Página 236
... animals appear won- derfully alike ; and in such widely sundered groups no part of this resemblance can be due to inheritance . from a common progenitor . Mr. Mivart has advanced this. 236 DIFFICULTIES OF THE THEORY [ CHAP . VI .
... animals appear won- derfully alike ; and in such widely sundered groups no part of this resemblance can be due to inheritance . from a common progenitor . Mr. Mivart has advanced this. 236 DIFFICULTIES OF THE THEORY [ CHAP . VI .
Página 237
... Mivart has advanced this case as one of special difficulty , but I am unable to see the force of his argument . An organ for vision must be formed of transparent tissue , and must include some sort of lens for throwing an image at the ...
... Mivart has advanced this case as one of special difficulty , but I am unable to see the force of his argument . An organ for vision must be formed of transparent tissue , and must include some sort of lens for throwing an image at the ...
Página 275
... Mivart , has recently collected all the objections which have ever been advanced by myself and others against the ... Mivart's plan to give the various facts and considerations opposed to his conclusions , no slight effort of reason and ...
... Mivart , has recently collected all the objections which have ever been advanced by myself and others against the ... Mivart's plan to give the various facts and considerations opposed to his conclusions , no slight effort of reason and ...
Página 277
... Mivart's objections , it may be well to explain once again how natural selection will act in all ordinary cases . Man has modified some of his animals , without neces- sarily having attended to special points of structure , by simply ...
... Mivart's objections , it may be well to explain once again how natural selection will act in all ordinary cases . Man has modified some of his animals , without neces- sarily having attended to special points of structure , by simply ...
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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