On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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... single original ancestor ; but he was the first to give that idea general currency and to secure its acceptance by means of his tuminous conception of Natural Selection . Organic Evolu- tion triumphed through Darwin . GRANT ALLEN . 273 ...
... single original ancestor ; but he was the first to give that idea general currency and to secure its acceptance by means of his tuminous conception of Natural Selection . Organic Evolu- tion triumphed through Darwin . GRANT ALLEN . 273 ...
Página 2
... single point is discussed in this volume on which facts cannot be adduced , often apparently leading to conclusions directly opposite to those at which I have arrived . A fair result can be obtained only by fully stating and balancing ...
... single point is discussed in this volume on which facts cannot be adduced , often apparently leading to conclusions directly opposite to those at which I have arrived . A fair result can be obtained only by fully stating and balancing ...
Página 9
... single bud or offset , which suddenly assumes a new and sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , etc. , and sometimes by seed . These ' sports ' are extremely rare ...
... single bud or offset , which suddenly assumes a new and sometimes very different character from that of the rest of the plant . Such buds can be propagated by grafting , etc. , and sometimes by seed . These ' sports ' are extremely rare ...
Página 11
... single domestic animal can be named which has not in some country drooping ears ; and the view suggested by some authors , that the drooping is due to the disuse of the muscles of the ear , from the animals not being much alarmed by ...
... single domestic animal can be named which has not in some country drooping ears ; and the view suggested by some authors , that the drooping is due to the disuse of the muscles of the ear , from the animals not being much alarmed by ...
Página 14
... single variety should be turned loose in its new home . Nevertheless , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , it seems to me not improbable , that if we could succeed in ...
... single variety should be turned loose in its new home . Nevertheless , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , it seems to me not improbable , that if we could succeed in ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely