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On the Origin of Species by Means of Natural Selection: Or, The Preservation ...
Úplné zobrazenie - 1864
accumulated adapted affinities allied species America amount analogous ancient appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvae less living male mammals manner migration modification modified descendants mongrels natural selection naturalists nearly nest occasionally oceanic islands offspring organisation palaeontologists palaeozoic perfect pigeons plants pollen present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely