On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. GR PK 8 . FB 부활 을 i INTRODUCTION CONTENTS CHAPTER I VARIATION UNDER DOMESTICATION Causes of Variability.
Or, The Preservation of Favoured Races in the Struggle for Life Charles Darwin. GR PK 8 . FB 부활 을 i INTRODUCTION CONTENTS CHAPTER I VARIATION UNDER DOMESTICATION Causes of Variability.
7 페이지
... Causes of Variability - Effects of Habit - Correlation of Growth- Inheritance - Character of Domestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species ...
... Causes of Variability - Effects of Habit - Correlation of Growth- Inheritance - Character of Domestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species ...
9 페이지
... Causes of the sterility of first crosses and of hybrids - Parallelism between the effects of changed conditions of life and of crossing - Fertility of varieties when crossed and of their mongrel offspring not universal - Hybrids and ...
... Causes of the sterility of first crosses and of hybrids - Parallelism between the effects of changed conditions of life and of crossing - Fertility of varieties when crossed and of their mongrel offspring not universal - Hybrids and ...
11 페이지
... Causes of the general belief in the immutability of species - How far the theory of natural selection may be extended - Effects of its adoption on the study of Natural history - Concluding remarks HISTORICAL SKETCH INDEX 388 415 423 ...
... Causes of the general belief in the immutability of species - How far the theory of natural selection may be extended - Effects of its adoption on the study of Natural history - Concluding remarks HISTORICAL SKETCH INDEX 388 415 423 ...
14 페이지
... which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one very limited sense , as we 14 INTRODUCTION.
... which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one very limited sense , as we 14 INTRODUCTION.
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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