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 7
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges CHAPTER III STRUGGLE FOR EXISTENCE 49 Its bearing on natural selection ...
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges CHAPTER III STRUGGLE FOR EXISTENCE 49 Its bearing on natural selection ...
Page 17
... genera are lineal descendants of some other and generally extinct species , in the same manner the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am con- vinced that Natural Selection has ...
... genera are lineal descendants of some other and generally extinct species , in the same manner the acknowledged varieties of any one species are the descendants of that species . Furthermore , I am con- vinced that Natural Selection has ...
Page 26
... genera which I shall presently give , we have no right to expect often to meet with generic differences in our domesticated productions . When we attempt to estimate the amount of structural difference between the domestic races of the ...
... genera which I shall presently give , we have no right to expect often to meet with generic differences in our domesticated productions . When we attempt to estimate the amount of structural difference between the domestic races of the ...
Page 34
... genera- tions , for we know of no fact countenancing the belief that the child ever reverts to some one ancestor , removed by a greater number of generations . In a breed which has been crossed only once with some distinct breed , the ...
... genera- tions , for we know of no fact countenancing the belief that the child ever reverts to some one ancestor , removed by a greater number of generations . In a breed which has been crossed only once with some distinct breed , the ...
Page 49
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . 66 BEFORE applying the principles arrived at in the last chapter to ...
... genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ranges . 66 BEFORE applying the principles arrived at in the last chapter to ...
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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