On the Origin of Species by Means of Natural Selection |
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Page 3
... the descent and modification of species ; and supports this doctrine by many original and valuable observations . CHARLES DARWIN DOWN , BROMLEY , KENT , Feb. 1860 . INTRODUCTION , CONTENTS . Page 1 CHAPTER I. VARIATION UNDER PREFACE . R.
... the descent and modification of species ; and supports this doctrine by many original and valuable observations . CHARLES DARWIN DOWN , BROMLEY , KENT , Feb. 1860 . INTRODUCTION , CONTENTS . Page 1 CHAPTER I. VARIATION UNDER PREFACE . R.
Page 5
... VARIATION UNDER NATURE . • 14 Variability - Individual differences - Doubtful species - Wide ranging , much diffused , and common species vary most - Species of the larger genera in any country vary more than the species of the smaller ...
... VARIATION UNDER NATURE . • 14 Variability - Individual differences - Doubtful species - Wide ranging , much diffused , and common species vary most - Species of the larger genera in any country vary more than the species of the smaller ...
Page 6
... VARIATION . 77 Effects of external conditions - Use and disuse , combined with natural selection organs of flight and of vision - Acclimatisation - Correlation of growth - Compen sation and economy of growth - False correlations ...
... VARIATION . 77 Effects of external conditions - Use and disuse , combined with natural selection organs of flight and of vision - Acclimatisation - Correlation of growth - Compen sation and economy of growth - False correlations ...
Page 11
... variation . In one very limited sense , as we shall hereafter see , this may be true ; but it is preposterous to attribute to mere external conditions , the structure , for instance , of the woodpecker , with its feet , tail , beak ...
... variation . In one very limited sense , as we shall hereafter see , this may be true ; but it is preposterous to attribute to mere external conditions , the structure , for instance , of the woodpecker , with its feet , tail , beak ...
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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 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 principle 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