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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7 페이지
... Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects - Methodical and Unconscious Selection - Unknown Origin of our Domestic ...
... Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects - Methodical and Unconscious Selection - Unknown Origin of our Domestic ...
9 페이지
... origin- Instincts graduated - Aphides and ants - Instincts variable— Domestic instincts , their origin - Natural instincts of the cuckoo , ostrich , and parasitic bees - Slave - making ants - Hive - bee , its cell - making instinct ...
... origin- Instincts graduated - Aphides and ants - Instincts variable— Domestic instincts , their origin - Natural instincts of the cuckoo , ostrich , and parasitic bees - Slave - making ants - Hive - bee , its cell - making instinct ...
11 페이지
... origin explained - Summary 351 CHAPTER XIV ✓ RECAPITULATION AND CONCLUSION Recapitulation of the difficulties on the theory of Natural Selection -Recapitulation of the general and special circumstances in its favour - Causes of the ...
... origin explained - Summary 351 CHAPTER XIV ✓ RECAPITULATION AND CONCLUSION Recapitulation of the difficulties on the theory of Natural Selection -Recapitulation of the general and special circumstances in its favour - Causes of the ...
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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