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 24
... tion there will be less of the foreign blood ; but when there has been no cross with a distinct breed , and there is a tendency in both parents to revert to a char- acter , which has been lost during some former generation , this ...
... tion there will be less of the foreign blood ; but when there has been no cross with a distinct breed , and there is a tendency in both parents to revert to a char- acter , which has been lost during some former generation , this ...
Página 25
... tion ; these supposed species being quite unknown in a wild state , and their becoming nowhere feral ; these species having very abnormal characters in certain re- spects , as compared with all other Columbida , though so like in most ...
... tion ; these supposed species being quite unknown in a wild state , and their becoming nowhere feral ; these species having very abnormal characters in certain re- spects , as compared with all other Columbida , though so like in most ...
Página 35
... tion in their structure or in their habits to man's wants or fancies . We can , I think , further understand the frequently abnormal character of our domestic races , and likewise their differences being so great in external characters ...
... tion in their structure or in their habits to man's wants or fancies . We can , I think , further understand the frequently abnormal character of our domestic races , and likewise their differences being so great in external characters ...
Página 37
... tion of a large amount of modification in almost any desired direction . But as variations manifestly useful or pleasing to man appear only occasionally , the chance of their appearance will be much increased by a large number of ...
... tion of a large amount of modification in almost any desired direction . But as variations manifestly useful or pleasing to man appear only occasionally , the chance of their appearance will be much increased by a large number of ...
Página 73
... tion caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction , on the ...
... tion caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Divergence of Character and Extinction , on the ...
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