On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página viii
... islands Absence of Batrachians and of terrestrial Mammals - On the relation of the inhabitants of islands to those of the nearest main- land - On colonization from the nearest source with subsequent modi- fication Summary of the last ...
... islands Absence of Batrachians and of terrestrial Mammals - On the relation of the inhabitants of islands to those of the nearest main- land - On colonization from the nearest source with subsequent modi- fication Summary of the last ...
Página xvii
... creations in and for those islands respec- tively . Always . also , it may be well to bear in mind that by the word ' creation the zoologist means a process he knows not what . ' He amplifies this idea by adding , Historical Sketch . xvii.
... creations in and for those islands respec- tively . Always . also , it may be well to bear in mind that by the word ' creation the zoologist means a process he knows not what . ' He amplifies this idea by adding , Historical Sketch . xvii.
Página xviii
... islands , he chiefly expresses that he knows not how the Red Grouse came to be there , and there exclusively ; signifying also , by this mode of expressing such ignorance , his belief that both the bird and the islands owed their origin ...
... islands , he chiefly expresses that he knows not how the Red Grouse came to be there , and there exclusively ; signifying also , by this mode of expressing such ignorance , his belief that both the bird and the islands owed their origin ...
Página 36
... island a great range of varieties connected by intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archipelago . Thus also with ants ...
... island a great range of varieties connected by intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archipelago . Thus also with ants ...
Página 37
... island . The local forms are moderately constant and distinct in each separate island ; but when all from the several islands are compared together , the dif- ferences are seen to be so slight and graduated , CHAP . 11 . 37 Doubtful ...
... island . The local forms are moderately constant and distinct in each separate island ; but when all from the several islands are compared together , the dif- ferences are seen to be so slight and graduated , CHAP . 11 . 37 Doubtful ...
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Términos y frases comunes
adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young