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 22
... ranked by some competent judges as mere varieties , and by other competent judges as the descendants of aborigi- nally distinct species . If any marked distinction existed between domestic races and species , this source of doubt could ...
... ranked by some competent judges as mere varieties , and by other competent judges as the descendants of aborigi- nally distinct species . If any marked distinction existed between domestic races and species , this source of doubt could ...
Page 27
... ranked by him as well - defined species . Moreover , Í do not believe that any ornithologist would place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more espe- cially ...
... ranked by him as well - defined species . Moreover , Í do not believe that any ornithologist would place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more espe- cially ...
Page 39
... ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recognised in the increased size and beauty which we now see in the ...
... ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recognised in the increased size and beauty which we now see in the ...
Page 48
... Practically , when a naturalist can unite two forms together by others hav- ing intermediate characters , he treats the one as a variety of the other , ranking the most common , but 48 [ CHAP . II VARIATION UNDER NATURE .
... Practically , when a naturalist can unite two forms together by others hav- ing intermediate characters , he treats the one as a variety of the other , ranking the most common , but 48 [ CHAP . II VARIATION UNDER NATURE .
Page 49
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
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Common terms and phrases
accumulated adapted affinities allied species America amount ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic 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 intermediate land larvæ laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely