The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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412 페이지
... Islands of Bermuda and Madeira have been stocked from the neighboring continents with birds , which for long ages have there struggled together , and ... islands not tenanted by a single mammal , some 412 INHABITANTS OF OCEANIC ISLANDS .
... Islands of Bermuda and Madeira have been stocked from the neighboring continents with birds , which for long ages have there struggled together , and ... islands not tenanted by a single mammal , some 412 INHABITANTS OF OCEANIC ISLANDS .
414 페이지
... island situated about 300 miles from a conti- nent or great continental island ; and many islands situated at a much less distance are equally barren . The Falkland Islands , which are inhabited by a wolf - like fox , come near- est to ...
... island situated about 300 miles from a conti- nent or great continental island ; and many islands situated at a much less distance are equally barren . The Falkland Islands , which are inhabited by a wolf - like fox , come near- est to ...
415 페이지
... islands . Hence , we have only to suppose that such wandering species have been modified in their new homes in relation to their new position , and we can understand the presence of endemic bats on oceanic islands , with the absence of ...
... islands . Hence , we have only to suppose that such wandering species have been modified in their new homes in relation to their new position , and we can understand the presence of endemic bats on oceanic islands , with the absence of ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young