On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCassell, 1909 - 430페이지 |
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100개의 결과 중 1 - 5개
8 페이지
... LAWS OF VARIATION Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision - Acclimatisa- tion - Correlation of growth - Compensation and economy of growth - False correlations ...
... LAWS OF VARIATION Effects of external conditions - Use and disuse , combined with natural selection ; organs of flight and of vision - Acclimatisa- tion - Correlation of growth - Compensation and economy of growth - False correlations ...
9 페이지
... law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection 160 CHAPTER VII ... Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
... law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection 160 CHAPTER VII ... Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on other differences ...
11 페이지
... laws of , explained by variations not supervening at an early age , and being inherited at a corresponding age -RUDIMENTARY ORGANS ; their origin explained - Summary 351 CHAPTER XIV ✓ RECAPITULATION AND CONCLUSION Recapitulation of the ...
... laws of , explained by variations not supervening at an early age , and being inherited at a corresponding age -RUDIMENTARY ORGANS ; their origin explained - Summary 351 CHAPTER XIV ✓ RECAPITULATION AND CONCLUSION Recapitulation of the ...
16 페이지
... laws of variation and of corre- lation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given : namely , first , the difficulties of transitions , or in understanding how a ...
... laws of variation and of corre- lation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given : namely , first , the difficulties of transitions , or in understanding how a ...
20 페이지
... laws are which determine the reproduction of animals under confinement , I may just mention that carnivorous animals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plan ...
... laws are which determine the reproduction of animals under confinement , I may just mention that carnivorous animals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plan ...
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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