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 58
... extinction , and variation , will be dimly seen or quite misunderstood . We behold the face of nature bright with gladness , we often see superabundance of food ; we do not see , or we forget that the birds which are idly singing round ...
... extinction , and variation , will be dimly seen or quite misunderstood . We behold the face of nature bright with gladness , we often see superabundance of food ; we do not see , or we forget that the birds which are idly singing round ...
Página 61
... , and yet the average stock be fully kept up ; but if many eggs or young are destroyed , many must be produced , or the species will become extinct . It would suffice to keep up the full number of STRUGGLE FOR EXISTENCE 61.
... , and yet the average stock be fully kept up ; but if many eggs or young are destroyed , many must be produced , or the species will become extinct . It would suffice to keep up the full number of STRUGGLE FOR EXISTENCE 61.
Página 67
... so profound is our ignorance , and so high our presumption , that we marvel when we hear of the extinction of an organic being ; and as we do not see the cause , we invoke cataclysms to desolate STRUGGLE FOR EXISTENCE 67.
... so profound is our ignorance , and so high our presumption , that we marvel when we hear of the extinction of an organic being ; and as we do not see the cause , we invoke cataclysms to desolate STRUGGLE FOR EXISTENCE 67.
Página 68
... extinct or very rare in England , the heartsease and red clover would become very rare , or wholly disappear . The number of humble - bees in any district depends in a great degree on the number of field - mice , which destroy their ...
... extinct or very rare in England , the heartsease and red clover would become very rare , or wholly disappear . The number of humble - bees in any district depends in a great degree on the number of field - mice , which destroy their ...
Página 73
... Extinction , on the descendants from a common parent - Explains the Grouping of all organic beings . How will the struggle for existence , discussed too briefly in the last chapter , act in regard to variation ? Can the principle of ...
... Extinction , on the descendants from a common parent - Explains the Grouping of all organic beings . How will the struggle for existence , discussed too briefly in the last chapter , act in regard to variation ? Can the principle of ...
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