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 125
... migrated by successive generations from the outer world into the deeper and deeper recesses of the Kentucky caves , as did European animals into the caves of Europe . We have some evidence of this gradation of habit ; for , as Schiödte ...
... migrated by successive generations from the outer world into the deeper and deeper recesses of the Kentucky caves , as did European animals into the caves of Europe . We have some evidence of this gradation of habit ; for , as Schiödte ...
Página 186
... migrate and to lay her eggs in other birds ' nests . An action , which we ourselves should require experience to enable us to perform , when performed by an animal , more especially by a very young one , without any experience , and ...
... migrate and to lay her eggs in other birds ' nests . An action , which we ourselves should require experience to enable us to perform , when performed by an animal , more especially by a very young one , without any experience , and ...
Página 195
... migrate at a very early period ; and the first hatched young would probably have to be fed by the male alone . But the American cuckoo is in this predicament ; for she makes her own nest and has eggs and young successively hatched , all ...
... migrate at a very early period ; and the first hatched young would probably have to be fed by the male alone . But the American cuckoo is in this predicament ; for she makes her own nest and has eggs and young successively hatched , all ...
Página 197
... migrate , it is the slaves which determine the migration , and actually carry their masters in their jaws . So utterly helpless are the masters , that when Huber shut up thirty of them without a slave , but with plenty of the food which ...
... migrate , it is the slaves which determine the migration , and actually carry their masters in their jaws . So utterly helpless are the masters , that when Huber shut up thirty of them without a slave , but with plenty of the food which ...
Página 198
... than in England . One day I fortunately witnessed a migration of F. sanguinea from one nest to another , and it was a most interesting spectacle to behold the masters carefully carrying ( instead 198 ON THE ORIGIN OF SPECIES.
... than in England . One day I fortunately witnessed a migration of F. sanguinea from one nest to another , and it was a most interesting spectacle to behold the masters carefully carrying ( instead 198 ON THE ORIGIN OF SPECIES.
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