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 68
... Genera in each Country vary more frequently than the Species of the Smaller Genera . If the plants inhabiting a country , as described in any Flora , be divided into two equal masses , all those in the larger genera ( i . e . , those ...
... Genera in each Country vary more frequently than the Species of the Smaller Genera . If the plants inhabiting a country , as described in any Flora , be divided into two equal masses , all those in the larger genera ( i . e . , those ...
Page 70
... genera which pre- sent any varieties , invariably present a larger average number of varieties than do the species of the small genera . Both these results follow when another divis- ion is made , and when all the least genera , with ...
... genera which pre- sent any varieties , invariably present a larger average number of varieties than do the species of the small genera . Both these results follow when another divis- ion is made , and when all the least genera , with ...
Page 204
... genera still far- ther to the right hand , which diverged at an earlier period . And all these genera , descended from ( A ) , form an order distinct from the genera descended from ( I ) . So that we here have many species descended ...
... genera still far- ther to the right hand , which diverged at an earlier period . And all these genera , descended from ( A ) , form an order distinct from the genera descended from ( I ) . So that we here have many species descended ...
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