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
... Character of . Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin- Principles of Selection ...
... Character of . Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin- Principles of Selection ...
Página vi
... characters of trifling importance - its power at all ages and on both sexes - Sexual selection - On the generality ... Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural ...
... characters of trifling importance - its power at all ages and on both sexes - Sexual selection - On the generality ... Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural ...
Página vii
... characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary . Page 164 CHAPTER VI . DIFFICULTIES OF THE THEORY ...
... characters more variable than generic : secondary sexual characters variable - Species of the same genus vary in an analogous manner - Reversions to long - lost characters - Summary . Page 164 CHAPTER VI . DIFFICULTIES OF THE THEORY ...
Página xvi
... characters alone . After remarking that ne- groes and mulattoes enjoy an immunity from certain tropical diseases , he observes , firstly , that all animals tend to vary in some degree , and , secondly , that agri- culturists improve ...
... characters alone . After remarking that ne- groes and mulattoes enjoy an immunity from certain tropical diseases , he observes , firstly , that all animals tend to vary in some degree , and , secondly , that agri- culturists improve ...
Página xviii
... characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " In 1843-44 Professor Haldeman ( ' Boston Journal of Nat . Hist . U. States , ' vol . iv . p . 468 ) has ably given the ...
... characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " In 1843-44 Professor Haldeman ( ' Boston Journal of Nat . Hist . U. States , ' vol . iv . p . 468 ) has ably given the ...
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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