The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página v
... Varieties- Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed , their ...
... Varieties- Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed , their ...
Página vi
... varieties of the same species : often severe between species of the same genus - The relation of organism to organism the most important of all relations .. Page 44 CHAPTER IV . NATURAL SELECTION ; OR THE SURVIVAL OF THE FITTEST ...
... varieties of the same species : often severe between species of the same genus - The relation of organism to organism the most important of all relations .. Page 44 CHAPTER IV . NATURAL SELECTION ; OR THE SURVIVAL OF THE FITTEST ...
Página viii
... varieties at the present day - On the nature of extinct intermediate varieties ; on their number - On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by years - On the ...
... varieties at the present day - On the nature of extinct intermediate varieties ; on their number - On the lapse of time , as inferred from the rate of denudation and of deposition - On the lapse of time as estimated by years - On the ...
Página xv
... varieties of mankind , fitted for the country which they inhabit . Of the accidental varieties of man , which would occur among the first few and scattered inhabitants of the middle regions of Africa , some one would be better fitted ...
... varieties of mankind , fitted for the country which they inhabit . Of the accidental varieties of man , which would occur among the first few and scattered inhabitants of the middle regions of Africa , some one would be better fitted ...
Página xvi
... varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " " " In 1843-44 Professor ...
... varieties once , and many varieties are gradually becoming species by assuming constant and peculiar characters ; " but farther on ( p . 18 ) he adds , " except the original types or ancestors of the genus . " " " In 1843-44 Professor ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young