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 93
... become modified and improved in a corresponding degree with its com- petitors , it will soon be exterminated . In man's methodical selection , a breeder selects for some definite object , and free intercrossing will wholly stop his work ...
... become modified and improved in a corresponding degree with its com- petitors , it will soon be exterminated . In man's methodical selection , a breeder selects for some definite object , and free intercrossing will wholly stop his work ...
Página 97
... become so largely naturalised on islands . On a small island , the race for life will have been less severe , and there will have been less modification and less exter- mination . Hence , perhaps , it comes that the flora of Madeira ...
... become so largely naturalised on islands . On a small island , the race for life will have been less severe , and there will have been less modification and less exter- mination . Hence , perhaps , it comes that the flora of Madeira ...
Página 98
... become well modified and perfected . When , by renewed elevation , the islands shall be re- converted into a ... becoming slowly modified ; the mutual relations of many of the other inhabitants being thus disturbed . Nothing can be ...
... become well modified and perfected . When , by renewed elevation , the islands shall be re- converted into a ... becoming slowly modified ; the mutual relations of many of the other inhabitants being thus disturbed . Nothing can be ...
Página 99
... become rare . Rarity , as geology tells us , is the precursor to extinction . We can , also , see that any form repre- sented by few individuals will , during fluctuations in the seasons or in the number of its enemies , run a good ...
... become rare . Rarity , as geology tells us , is the precursor to extinction . We can , also , see that any form repre- sented by few individuals will , during fluctuations in the seasons or in the number of its enemies , run a good ...
Página 100
... become naturalised , without causing , as far as we know , the extinction of any natives . Furthermore , the species which are most numerous in individuals will have the best chance of producing within any given period favourable ...
... become naturalised , without causing , as far as we know , the extinction of any natives . Furthermore , the species which are most numerous in individuals will have the best chance of producing within any given period favourable ...
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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