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 xvi
... supposed " impulses ' " account in a scientific sense for the numerous and beautiful co - adaptations which we see throughout nature ; I cannot see that we thus gain any insight how , for in- stance , a woodpecker has become adapted to ...
... supposed " impulses ' " account in a scientific sense for the numerous and beautiful co - adaptations which we see throughout nature ; I cannot see that we thus gain any insight how , for in- stance , a woodpecker has become adapted to ...
Page xviii
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circumambient mole- cules of a particular nature , and thus ...
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circumambient mole- cules of a particular nature , and thus ...
Page 24
... supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are ...
... supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are ...
Page 27
... supposed species of pigeons to breed freely under domestication ; these supposed species being quite unknown in a wild state , and their becoming nowhere feral ; these species having very abnormal characters in certain respects , as ...
... supposed species of pigeons to breed freely under domestication ; these supposed species being quite unknown in a wild state , and their becoming nowhere feral ; these species having very abnormal characters in certain respects , as ...
Page 45
... to the physical conditions of life ; and " variations " in this sense are supposed not to be inherited : but who can say that the dwarfed condition of shells in the brackish CHAP . II . 45 VARIATION UNDER NATURE . III.
... to the physical conditions of life ; and " variations " in this sense are supposed not to be inherited : but who can say that the dwarfed condition of shells in the brackish CHAP . II . 45 VARIATION UNDER NATURE . III.
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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