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 200
... migration ) and numerous pupæ . I traced a long file of ants burthened with booty , for about forty yards , to a ... migrations , does not collect food for itself or its young , and cannot even feed itself : it is absolutely dependent on ...
... migration ) and numerous pupæ . I traced a long file of ants burthened with booty , for about forty yards , to a ... migrations , does not collect food for itself or its young , and cannot even feed itself : it is absolutely dependent on ...
Página 263
... migration during climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well known , for instance , that several species ...
... migration during climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well known , for instance , that several species ...
Página 264
... migration of the inhabitants of Europe during the Glacial period , which forms only a part of one whole geological period ; and likewise to reflect on the great changes of level , on the inordinately great change of climate , on the ...
... migration of the inhabitants of Europe during the Glacial period , which forms only a part of one whole geological period ; and likewise to reflect on the great changes of level , on the inordinately great change of climate , on the ...
Página 270
... migrate , and no closely consecutive record of their modifications could be preserved in any one formation . Very many of the marine inhabitants of the archi- pelago now range thousands of miles beyond its con- fines ; and analogy leads ...
... migrate , and no closely consecutive record of their modifications could be preserved in any one formation . Very many of the marine inhabitants of the archi- pelago now range thousands of miles beyond its con- fines ; and analogy leads ...
Página 281
... migration from a distinct geographical province , seems to me satisfactory . I These several facts accord well with my theory . believe in no fixed law of development , causing all the inhabitants of a country to change abruptly , or ...
... migration from a distinct geographical province , seems to me satisfactory . I These several facts accord well with my theory . believe in no fixed law of development , causing all the inhabitants of a country to change abruptly , or ...
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