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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Página 1
... facts in the distribution of the inhabitants of South America , and in the geological relations of the present to the past inhabitants of that continent . These facts seemed to me to throw some light on the origin of species - that ...
... facts in the distribution of the inhabitants of South America , and in the geological relations of the present to the past inhabitants of that continent . These facts seemed to me to throw some light on the origin of species - that ...
Página 2
... 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 the facts and arguments on both sides of each ...
... 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 the facts and arguments on both sides of each ...
Página 3
... facts , might come to the conclusion that each species had not been independently created , but had descended , like varieties , from other species . Nevertheless , such a conclusion , even if well founded , would be unsatisfactory ...
... facts , might come to the conclusion that each species had not been independently created , but had descended , like varieties , from other species . Nevertheless , such a conclusion , even if well founded , would be unsatisfactory ...
Página 11
... facts collected by Heusinger , it ap- pears that white sheep and pigs are differently affected from coloured individuals by certain vegetable poisons . Hairless dogs have imperfect teeth ; long - haired and coarse - haired animals are ...
... facts collected by Heusinger , it ap- pears that white sheep and pigs are differently affected from coloured individuals by certain vegetable poisons . Hairless dogs have imperfect teeth ; long - haired and coarse - haired animals are ...
Página 13
... facts make me believe that the rule has a wider extension , and that when there is no apparent reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which ...
... facts make me believe that the rule has a wider extension , and that when there is no apparent reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which ...
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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