On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 10
... Species once lost do not reappear- Groups of species follow the same general rules in their appear- ance and disappearance as do single species - On Extinction- On simultaneous changes in the forms of life throughout the world - On the ...
... Species once lost do not reappear- Groups of species follow the same general rules in their appear- ance and disappearance as do single species - On Extinction- On simultaneous changes in the forms of life throughout the world - On the ...
Page 11
... groups subordinate to groups - Natural system- Rules and difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or ...
... groups subordinate to groups - Natural system- Rules and difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or ...
Page 36
... species of finches , or other large groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed ...
... species of finches , or other large groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the various domestic animals and the cultivators of plants , with whom I have conversed ...
Page 55
... groups and in other countries , by which to correct his first impressions . As he extends the range of his observations , he will meet with more cases of difficulty ; for he will encounter a greater number of closely - allied forms ...
... groups and in other countries , by which to correct his first impressions . As he extends the range of his observations , he will meet with more cases of difficulty ; for he will encounter a greater number of closely - allied forms ...
Page 60
... species of a genus have been formed , on an average many are still forming ; and this holds good . There are other relations between the species ... groups . As Fries has well remarked , little groups of species are generally clustered like ...
... species of a genus have been formed , on an average many are still forming ; and this holds good . There are other relations between the species ... groups . As Fries has well remarked , little groups of species are generally clustered like ...
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Common terms and phrases
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