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 v
... Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects- Methodical and Unconscious Selection - Unknown Origin of our Domestic ...
... Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects- Methodical and Unconscious Selection - Unknown Origin of our Domestic ...
Page 27
... origin of our pigeons , it must be assumed that at least seven or eight species were so thoroughly domesticated in ancient times by half - civilised man , as to be quite pro- lific under confinement . An argument of great weight , and ...
... origin of our pigeons , it must be assumed that at least seven or eight species were so thoroughly domesticated in ancient times by half - civilised man , as to be quite pro- lific under confinement . An argument of great weight , and ...
Page 175
... origin of some of our domestic animals from several wild stocks ; the blood , for instance , of a tropical and arctic wolf may perhaps be mingled in our domestic breeds . The rat and mouse cannot be con- sidered as domestic animals ...
... origin of some of our domestic animals from several wild stocks ; the blood , for instance , of a tropical and arctic wolf may perhaps be mingled in our domestic breeds . The rat and mouse cannot be con- sidered as domestic animals ...
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