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
... 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 - Domestic ...
... 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 - Domestic ...
15 페이지
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
19 페이지
... 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 - Domestic ...
... 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 - Domestic ...
20 페이지
... variability may be attributed to the male and female reproductive elements having been affected prior to the act of con- ception . Several reasons make me believe in this ; but the chief one is the remarkable effect which confinement or ...
... variability may be attributed to the male and female reproductive elements having been affected prior to the act of con- ception . Several reasons make me believe in this ; but the chief one is the remarkable effect which confinement or ...
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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