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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11 페이지
... 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 ...
... 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 ...
24 페이지
... explaining the laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to its primary cause , which may have acted on the ovules or on the male element ; in nearly the same manner ...
... explaining the laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to its primary cause , which may have acted on the ovules or on the male element ; in nearly the same manner ...
26 페이지
... explained , will determine how far the new characters thus arising shall be preserved . ] When we look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely allied species , we generally ...
... explained , will determine how far the new characters thus arising shall be preserved . ] When we look to the hereditary varieties or races of our domestic animals and plants , and compare them with closely allied species , we generally ...
36 페이지
... explaining the immense amount of variation which pigeons have undergone , will be obvious when we treat of Selection . We shall then , also , see how it is that the several breeds so often have a somewhat monstrous character . It is ...
... explaining the immense amount of variation which pigeons have undergone , will be obvious when we treat of Selection . We shall then , also , see how it is that the several breeds so often have a somewhat monstrous character . It is ...
44 페이지
... explained , two sub - breeds might be formed . This , perhaps , partly explains what has been remarked by some authors , namely , that the varieties kept by savages have more of the character of species than the varieties kept in ...
... explained , two sub - breeds might be formed . This , perhaps , partly explains what has been remarked by some authors , namely , that the varieties kept by savages have more of the character of species than the varieties kept in ...
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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