The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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... Domestic Varieties from one or more Species . When we look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely allied species , we generally perceive in each domestic race , as already ...
... Domestic Varieties from one or more Species . When we look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely allied species , we generally perceive in each domestic race , as already ...
175 페이지
... domestic animals were originally chosen by uncivilised man because they were useful and because they bred readily under confinement , and not because they were subsequently found capable of far - extended transportation , the common and ...
... domestic animals were originally chosen by uncivilised man because they were useful and because they bred readily under confinement , and not because they were subsequently found capable of far - extended transportation , the common and ...
325 페이지
... domestic pigeons , i . 26 . Cephalopoda , structures of eyes , i . Colymbetes , ii . 174 . 236 . development of , ii . 244 . Cercopithecus , tail of , i . 294 . Ceroxylus laceratus , i . 284 . Cervulus , ii . 9 . Cetacea , teeth and ...
... domestic pigeons , i . 26 . Cephalopoda , structures of eyes , i . Colymbetes , ii . 174 . 236 . development of , ii . 244 . Cercopithecus , tail of , i . 294 . Ceroxylus laceratus , i . 284 . Cervulus , ii . 9 . Cetacea , teeth and ...
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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