The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Volumes 1-2D. Appleton, 1917 - Evolution |
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Page 129
... continuous area , and will thus come into com- petition with many other forms . Moreover , great areas , though now continuous , will often , owing to former os- cillations of level , have existed in a broken condition ; so that the ...
... continuous area , and will thus come into com- petition with many other forms . Moreover , great areas , though now continuous , will often , owing to former os- cillations of level , have existed in a broken condition ; so that the ...
Page 210
... continuous , that it has been continuous during a long period . Geology would lead us to believe that most continents have been broken up into islands even during the later tertiary periods ; and in such islands distinct species might ...
... continuous , that it has been continuous during a long period . Geology would lead us to believe that most continents have been broken up into islands even during the later tertiary periods ; and in such islands distinct species might ...
Page 156
... continuous land from wes- tern Europe , through Siberia , to eastern America . And this continuity of the circumpolar land , with the con- sequent freedom under a more favourable climate for in- termigration , will account for the ...
... continuous land from wes- tern Europe , through Siberia , to eastern America . And this continuity of the circumpolar land , with the con- sequent freedom under a more favourable climate for in- termigration , will account for the ...
Contents
VARIATION UNDER DOMESTICATION | 7 |
CHAPTER II | 51 |
STRUGGLE FOR EXISTENCE | 66 |
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Common terms and phrases
adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings