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 173
... perfect as , or slightly more perfect than , the other inhabitants of the same country with which it has to struggle for existence . And we see that this is the degree of perfection attained under nature . The endemic productions of New ...
... perfect as , or slightly more perfect than , the other inhabitants of the same country with which it has to struggle for existence . And we see that this is the degree of perfection attained under nature . The endemic productions of New ...
Page 214
... perfect , or even more than commonly perfect , fertility in a first cross between two distinct species . 66 This case of the Crinum leads me to refer to a most singular fact , namely , that there are individual plants , as with certain ...
... perfect , or even more than commonly perfect , fertility in a first cross between two distinct species . 66 This case of the Crinum leads me to refer to a most singular fact , namely , that there are individual plants , as with certain ...
Page 259
... perfect manner in which specimens are preserved in the oldest tertiary beds , from the ease with which even a fragment of a valve can be recog- nized from all these circumstances I inferred that had sessile cirripedes existed during the ...
... perfect manner in which specimens are preserved in the oldest tertiary beds , from the ease with which even a fragment of a valve can be recog- nized from all these circumstances I inferred that had sessile cirripedes existed during the ...
Contents
INTRODUCTION | 1 |
STRUGGLE FOR EXISTENCE | 52 |
NATURAL SELECTION | 69 |
Copyright | |
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distant distinct species divergence doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formation forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional oceanic islands offspring Origin of Species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory tion trees variability variation vary whole widely