On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 20
... produce young ; whereas carnivorous birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same exact condition as in the most sterile hybrids . When , on the one ...
... produce young ; whereas carnivorous birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same exact condition as in the most sterile hybrids . When , on the one ...
Page 93
... produce a multitude of hybrids between distinct species ; for if you bring on the same brush a plant's own pollen and pollen from another species , the former will have such a prepotent effect , that it will invariably and completely ...
... produce a multitude of hybrids between distinct species ; for if you bring on the same brush a plant's own pollen and pollen from another species , the former will have such a prepotent effect , that it will invariably and completely ...
Page 156
... hybrid from a chestnut mare and male quagga , the hybrid , and even the pure offspring subsequently produced from the mare by a black Arabian sire , were much more plainly barred across the legs than is even the pure quagga . Lastly ...
... hybrid from a chestnut mare and male quagga , the hybrid , and even the pure offspring subsequently produced from the mare by a black Arabian sire , were much more plainly barred across the legs than is even the pure quagga . Lastly ...
Page 157
... produce the long - lost character , and that this tendency , from unknown ... created , will , I presume , assert that each species has been created with a ... hybrids resembling in their stripes , not their own parents , but other ...
... produce the long - lost character , and that this tendency , from unknown ... created , will , I presume , assert that each species has been created with a ... hybrids resembling in their stripes , not their own parents , but other ...
Page 219
... hybrids- Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication ... produced from them . Pure species have of course their organs of reproduction in a perfect condition , yet when ...
... hybrids- Sterility various in degree , not universal , affected by close inter- breeding , removed by domestication ... produced from them . Pure species have of course their organs of reproduction in a perfect condition , yet when ...
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Common terms and phrases
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