On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430 páginas |
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Página 4
... first exponents of the theory of evolu- tion , it was fitting that the full development of that theory should have been the work of Charles Darwin . Although his views and their exposition led to the greatest contro- versy of modern ...
... first exponents of the theory of evolu- tion , it was fitting that the full development of that theory should have been the work of Charles Darwin . Although his views and their exposition led to the greatest contro- versy of modern ...
Página 9
... first crosses and of hybrids - Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on ...
... first crosses and of hybrids - Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication - Laws governing the sterility of hybrids - Sterility not a special endowment , but incidental on ...
Página 15
... first chapter of this Abstract to Variation under Domestication . We shall thus see that a large amount of hereditary modification is at least possible ; and , what is equally or more important , we shall see how great is the power of ...
... first chapter of this Abstract to Variation under Domestication . We shall thus see that a large amount of hereditary modification is at least possible ; and , what is equally or more important , we shall see how great is the power of ...
Página 16
... first , the difficulties of transitions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ ; secondly , the subject of Instinct , or the ...
... first , the difficulties of transitions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ ; secondly , the subject of Instinct , or the ...
Página 22
... first appears to be directly due to such conditions ; but in some cases it can be shown that quite opposite conditions produce similar changes of structure . [ Nevertheless some slight amount of change may , I think , be attributed to ...
... first appears to be directly due to such conditions ; but in some cases it can be shown that quite opposite conditions produce similar changes of structure . [ Nevertheless some slight amount of change may , I think , be attributed to ...
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Términos y frases comunes
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