The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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... 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 ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young