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 97
... 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 , according to Oswald Heer ...
... 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 , according to Oswald Heer ...
Página 98
... islands , there will still exist many individuals of the same species on each island : intercrossing on the confines of the range of each species will thus be checked : after physical changes of any kind , immigration will be prevented ...
... islands , there will still exist many individuals of the same species on each island : intercrossing on the confines of the range of each species will thus be checked : after physical changes of any kind , immigration will be prevented ...
Página 120
... islands or near the coast . So with insects , Wollaston is convinced that residence near the sea affects their colours . Moquin - Tandon gives a list of plants which when growing near the sea - shore have their leaves in some degree ...
... islands or near the coast . So with insects , Wollaston is convinced that residence near the sea affects their colours . Moquin - Tandon gives a list of plants which when growing near the sea - shore have their leaves in some degree ...
Página 121
... islands . The insect - species confined to sea - coasts , as every collector knows , are often brassy or lurid . Plants which live exclusively on the sea - side are very apt to have fleshy leaves . He who believes in the creation of ...
... islands . The insect - species confined to sea - coasts , as every collector knows , are often brassy or lurid . Plants which live exclusively on the sea - side are very apt to have fleshy leaves . He who believes in the creation of ...
Página 122
... islands , tenanted by no beast of prey , has been caused by disuse . The ostrich indeed inhabits continents and is exposed to danger from which it cannot escape by flight , but by kicking it can defend itself from enemies , as well as ...
... islands , tenanted by no beast of prey , has been caused by disuse . The ostrich indeed inhabits continents and is exposed to danger from which it cannot escape by flight , but by kicking it can defend itself from enemies , as well as ...
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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