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 50
... range on an average over 69 of the provinces into which Mr. Watson has divided Great Britain . Now , in this same catalogue , 53 acknowledged varieties are recorded , and these range over 7.7 provinces ; whereas , the species to which ...
... range on an average over 69 of the provinces into which Mr. Watson has divided Great Britain . Now , in this same catalogue , 53 acknowledged varieties are recorded , and these range over 7.7 provinces ; whereas , the species to which ...
Page 150
... range of any one species , depending as it does on the range of others , will tend to be sharply defined . Moreover , each species on the confines of its range , where it exists in lessened numbers , will , during fluctuation in the ...
... range of any one species , depending as it does on the range of others , will tend to be sharply defined . Moreover , each species on the confines of its range , where it exists in lessened numbers , will , during fluctuation in the ...
Page 343
... range over the world , and many individual species have enormous ranges . It is not meant that in world - ranging genera all the species have a wide range , or even that they have on an average a wide range ; but only that some of the ...
... range over the world , and many individual species have enormous ranges . It is not meant that in world - ranging genera all the species have a wide range , or even that they have on an average a wide range ; but only that some of 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