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 v
... Individual differences - Doubtful species - Wide rang- ing , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera - Many of the species ...
... Individual differences - Doubtful species - Wide rang- ing , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera - Many of the species ...
Página vi
... individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of the same genus - The relation of ...
... individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of the same genus - The relation of ...
Página 5
... individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring struggle for existence , it follows that any being , if it vary how- ever slightly in any manner profitable to ...
... individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring struggle for existence , it follows that any being , if it vary how- ever slightly in any manner profitable to ...
Página 7
... individuals of the same vari- ety or sub - variety of our older cultivated plants and ani- mals , one of the first points which strikes us is , that they generally differ more from each other than do the in- dividuals of any one species ...
... individuals of the same vari- ety or sub - variety of our older cultivated plants and ani- mals , one of the first points which strikes us is , that they generally differ more from each other than do the in- dividuals of any one species ...
Página 8
... individuals exposed to certain conditions during several generations are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced ...
... individuals exposed to certain conditions during several generations are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced ...
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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