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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8 페이지
... Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Diver- gence of Character and Extinction , on ...
... Extinction caused by Natural Selection - Divergence of Character , related to the diversity of inhabitants of any small area , and to naturalisation - Action of Natural Selection , through Diver- gence of Character and Extinction , on ...
9 페이지
... IMPERFECTION OF THE GEOLOGICAL RECORD On the absence of intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number- 73 — A * On the vast lapse of time , as inferred from CONTENTS 9.
... IMPERFECTION OF THE GEOLOGICAL RECORD On the absence of intermediate varieties at the present day - On the nature of extinct intermediate varieties ; on their number- 73 — A * On the vast lapse of time , as inferred from CONTENTS 9.
10 페이지
... Extinction- On simultaneous changes in the forms of life throughout the world - On the affinities of extinct species to each other and to living species - On the state of development of ancient forms- On the succession of the same types ...
... Extinction- On simultaneous changes in the forms of life throughout the world - On the affinities of extinct species to each other and to living species - On the state of development of ancient forms- On the succession of the same types ...
11 페이지
... Extinction separates and defines groups - MORPHOLOGY , between members of the same class , between parts of the same individual— EMBRYOLOGY , laws of , explained by variations not supervening at an early age , and being inherited at a ...
... Extinction separates and defines groups - MORPHOLOGY , between members of the same class , between parts of the same individual— EMBRYOLOGY , laws of , explained by variations not supervening at an early age , and being inherited at a ...
16 페이지
... Extinction of the less improved forms of life , and leads to what I have called Divergence of Character . In the next chapter I shall discuss the complex and little known laws of variation and of corre- lation of growth . In the four ...
... Extinction of the less improved forms of life , and leads to what I have called Divergence of Character . In the next chapter I shall discuss the complex and little known laws of variation and of corre- lation of growth . In the four ...
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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