On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeH. Milford, 1914 - 454페이지 |
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60 페이지
... plants . The elephant is reckoned the slowest breeder of all known animals , and I have taken some pains to estimate ... plants : cases could be given of introduced plants which have become common throughout whole islands in a period of ...
... plants . The elephant is reckoned the slowest breeder of all known animals , and I have taken some pains to estimate ... plants : cases could be given of introduced plants which have become common throughout whole islands in a period of ...
71 페이지
... plants seems at first sight to have no sort of relation to other plants . But from the strong growth of young plants produced from such seeds ( as peas and beans ) , when sown in the midst of long grass , I suspect that the chief use of ...
... plants seems at first sight to have no sort of relation to other plants . But from the strong growth of young plants produced from such seeds ( as peas and beans ) , when sown in the midst of long grass , I suspect that the chief use of ...
104 페이지
... plants and insects on small and uniform islets ; and so in small ponds of fresh water . Farmers find that they can raise most food by a rotation of plants belonging to the most different orders : nature follows what may be called a ...
... plants and insects on small and uniform islets ; and so in small ponds of fresh water . Farmers find that they can raise most food by a rotation of plants belonging to the most different orders : nature follows what may be called a ...
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accumulated adapted affinities allied species America amount analogous ancient appear Archipelago 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 endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner 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 land larvæ less living males mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest occasional oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose tend theory tion trees variability variation vary whole widely