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 325
... widely within the same country , and as the sea is apparently a still more impassable barrier , that they never would have extended to distant countries . But the case is exactly the reverse . Not only have many fresh - water species ...
... widely within the same country , and as the sea is apparently a still more impassable barrier , that they never would have extended to distant countries . But the case is exactly the reverse . Not only have many fresh - water species ...
Page 343
... widely , as in the case of certain powerfully winged birds , will necessarily range widely ; for we should never forget that to range widely implies not only the power of crossing barriers , but the more important power of being ...
... widely , as in the case of certain powerfully winged birds , will necessarily range widely ; for we should never forget that to range widely implies not only the power of crossing barriers , but the more important power of being ...
Page 344
... widely it is apt to range . The relations just discussed - namely , low and slowly changing organisms ranging more widely than the high ; some of the species of widely ranging genera themselves ranging widely ; such facts , as alpine ...
... widely it is apt to range . The relations just discussed - namely , low and slowly changing organisms ranging more widely than the high ; some of the species of widely ranging genera themselves ranging widely ; such facts , as alpine ...
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