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
... species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera -Many of the species of the larger genera resemble ...
... species - Wide ranging , much diffused , and common species , vary most - Species of the larger genera in each country vary more frequently than the species of the smaller genera -Many of the species of the larger genera resemble ...
Página viii
... species - On their different rates of change - Species once lost do not reappear - Groups of species follow the same general rules in their appearance and disappearance as do single species - On extinction - On simultaneous changes in ...
... species - On their different rates of change - Species once lost do not reappear - Groups of species follow the same general rules in their appearance and disappearance as do single species - On extinction - On simultaneous changes in ...
Página xix
... species undergo , from the difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The ...
... species undergo , from the difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The ...
Página 4
... species and varieties , if he make due allowance for our profound ignorance in regard to the mutual relations of the many beings which live around us . Who can explain why one species ranges widely and is very numerous , and why another ...
... species and varieties , if he make due allowance for our profound ignorance in regard to the mutual relations of the many beings which live around us . Who can explain why one species ranges widely and is very numerous , and why another ...
Página 11
... Species ; origin of 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 ...
... Species ; origin of 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 ...
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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