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 138
... migrated over great distances ; whereas , in Egypt , during the last 3000 years , the conditions of life , as far as we know , have remained absolutely uniform . The fact of little or no modification having been effected since the ...
... migrated over great distances ; whereas , in Egypt , during the last 3000 years , the conditions of life , as far as we know , have remained absolutely uniform . The fact of little or no modification having been effected since the ...
Page 155
... 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 gra- dation of habit ; for , as ...
... 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 gra- dation of habit ; for , as ...
Page 227
... 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 ...
Page 237
... 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 pre- dicament ; for she makes her own nest and has eggs and young successively hatched ...
... 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 pre- dicament ; for she makes her own nest and has eggs and young successively hatched ...
Page 238
... migrate at a very early period ; then the old birds or the fostered young would gain an advantage . And analogy would lead me to believe , that the young thus reared would be apt to follow by inheritance the occa- sional and aberrant ...
... migrate at a very early period ; then the old birds or the fostered young would gain an advantage . And analogy would lead me to believe , that the young thus reared would be apt to follow by inheritance the occa- sional and aberrant ...
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Common terms and phrases
accumulated adapted affinities allied species America amount analogous ancient animals appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo 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 hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ laws less living male mammals manner Marsupials migration modification modified descendants mongrels natural selection naturalists nearly nest occasionally offspring organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor racter ranked reciprocal crosses remarked resemble rudimentary organs seeds Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely