The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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Página 14
... completely independ- ent of their systematic affinity , that is of any differ- ence in their structure or constitution , excepting in their reproductive systems . The diversity of the result in. 14 LAWS GOVERNING THE STERILITY [ CHAP . IX .
... completely independ- ent of their systematic affinity , that is of any differ- ence in their structure or constitution , excepting in their reproductive systems . The diversity of the result in. 14 LAWS GOVERNING THE STERILITY [ CHAP . IX .
Página 16
... completely the fertility of a hybrid may be independent of its external resemblance to either pure parent . Considering the several rules now given , which govern the fertility of first causes and of hybrids , we see that when forms ...
... completely the fertility of a hybrid may be independent of its external resemblance to either pure parent . Considering the several rules now given , which govern the fertility of first causes and of hybrids , we see that when forms ...
Página 32
... the common view , that his two varieties were as good and as distinct species as any in the world ; but he would be completely mistaken . The facts now given on dimorphic and trimorphic plants are. 32 [ CHAP . IX . RECIPROCAL DIMORPHISM.
... the common view , that his two varieties were as good and as distinct species as any in the world ; but he would be completely mistaken . The facts now given on dimorphic and trimorphic plants are. 32 [ CHAP . IX . RECIPROCAL DIMORPHISM.
Página 54
... the land has been so completely planed down that no trace of these vast dislocations is externally visible . The Craven fault , for instance , extends for upwards of 30 miles , and along this line the. 54 [ CHAP . X , THE LAPSE OF TIME .
... the land has been so completely planed down that no trace of these vast dislocations is externally visible . The Craven fault , for instance , extends for upwards of 30 miles , and along this line the. 54 [ CHAP . X , THE LAPSE OF TIME .
Página 63
... - tary beds of considerable horizontal extent have rarely been completely destroyed . But all geologists , except- ing the few who believe that our present metamorphic schists. CHAP . X. ] PALEONTOLOGICAL COLLECTIONS . 63.
... - tary beds of considerable horizontal extent have rarely been completely destroyed . But all geologists , except- ing the few who believe that our present metamorphic schists. CHAP . X. ] PALEONTOLOGICAL COLLECTIONS . 63.
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists Palæozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings