The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página vi
... THEORY 138 Difficulties of the theory of descent with modification- Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species- Species with habits widely different from those of ...
... THEORY 138 Difficulties of the theory of descent with modification- Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species- Species with habits widely different from those of ...
Página 173
... THEORY Difficulties of the theory of descent with modification- Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - Species with habits widely different from those of ...
... THEORY Difficulties of the theory of descent with modification- Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - Species with habits widely different from those of ...
Página 217
... theory of natural selection we can clearly understand the full meaning of that old canon in natural history , " Natura non facit saltum . " This canon , if we look to the present ... THEORY OF NATURAL SELECTION DIFFICULTIES OF THE THEORY 217.
... theory of natural selection we can clearly understand the full meaning of that old canon in natural history , " Natura non facit saltum . " This canon , if we look to the present ... THEORY OF NATURAL SELECTION DIFFICULTIES OF THE THEORY 217.
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour 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 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 marsupial migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs Origin of Species parent peculiar perfect pigeon pistil plants pollen present principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion variability variations varieties vary whilst whole wings young