On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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8 페이지
... action- Extinction 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 Diver- gence of Character and ...
... action- Extinction 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 Diver- gence of Character and ...
20 페이지
... action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male and female unite . How ...
... action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male and female unite . How ...
21 페이지
... action of the conditions been direct , if any of the young had varied , all would probably have varied in the same manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture ...
... action of the conditions been direct , if any of the young had varied , all would probably have varied in the same manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture ...
22 페이지
... action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and perhaps the thickness of fur from climate . ( Habit also has a decided influence , as in the period ...
... action of the conditions of life - as , in some cases , increased size from amount of food , colour from particular kinds of food , and perhaps the thickness of fur from climate . ( Habit also has a decided influence , as in the period ...
25 페이지
... action of the poor soil ) , that they would to a large extent , or even wholly , revert to the wild aboriginal stock . Whether or not the experiment would succeed , is not of great importance for our line of argument ; for by the ...
... action of the poor soil ) , that they would to a large extent , or even wholly , revert to the wild aboriginal stock . Whether or not the experiment would succeed , is not of great importance for our line of argument ; for by the ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely