The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 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 ...
Page 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 ...
Page 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 ...
Page 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 ...
Page xxii
... characters " sont fixés , pour chaque espèce , tant qu'elle se perpétue au milieu des mêmes circonstances : ils se modifient , si les circonstances ambiantes viennent à changer . " " En- résumé , l'observation des animaux sauvages ...
... characters " sont fixés , pour chaque espèce , tant qu'elle se perpétue au milieu des mêmes circonstances : ils se modifient , si les circonstances ambiantes viennent à changer . " " En- résumé , l'observation des animaux sauvages ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young