Contributions to the Theory of Natural Selection: A Series of EssaysAMS Press, 1973 - 384 pages Wallace noticed on expeditions to the Amazon and the Malay archipelego that mammals in Southeast Asia are more advanced than their Australian cousins. His suggestion was that the two continents had split before the better adapted mammals had evolved in Asia. The isolated Australian marsupials were able to thrive, whilst those in Asia were driven to extinction by competition from more advanced mammals. This led to his theory of natural selection, which he presented to the Linnean Society in 1858 with Charles Darwin. This volume reprints those papers presented to the Linnean Society. |
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Page 262
... flowers is shown by the striking fact , that those flowers which can be perfectly fertilized by the wind , and do not need the aid of insects , rarely or never have gaily- coloured flowers . This wide extension of the general principle ...
... flowers is shown by the striking fact , that those flowers which can be perfectly fertilized by the wind , and do not need the aid of insects , rarely or never have gaily- coloured flowers . This wide extension of the general principle ...
Page 270
... flowers of Orchids cannot be necessary per se , since exactly the same end is gained in ten thousand other flowers which do not possess them . Is it not then an extraordinary idea , to imagine the Creator of the Universe contriving the ...
... flowers of Orchids cannot be necessary per se , since exactly the same end is gained in ten thousand other flowers which do not possess them . Is it not then an extraordinary idea , to imagine the Creator of the Universe contriving the ...
Page 273
... flowers because they could not get a satisfying supply of nec- tar , and if these were the only moths in the country the flowers would undoubtedly suffer , and the further growth of the nectary be checked by exactly the same . process ...
... flowers because they could not get a satisfying supply of nec- tar , and if these were the only moths in the country the flowers would undoubtedly suffer , and the further growth of the nectary be checked by exactly the same . process ...
Contents
Geographical distribution dependent on Geologic Changes A | 4 |
On the Tendency of Varieties to depart indefinitely from | 26 |
onlyCause of the dull Colours of Female BirdsUse of the gaudy | 129 |
Copyright | |
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Other editions - View all
Contributions to the Theory of Natural Selection: A Series of Essays ... Alfred Russel Wallace No preview available - 2018 |
Contributions to the Theory of Natural Selection: A Series of Essays Alfred Russel Wallace No preview available - 2016 |
Common terms and phrases
abundant action adapted allied animals appear beauty become believe birds body brain build butterflies causes Celebes changes character closely colour common comparatively completely concealed consider conspicuous continually direction distinct effect equally evidence exactly example existence explained facts faculties female flowers force further genera genus give greater groups habits imitation important increase India individuals inhabiting insects instinct islands kind known less limited living male materials means mimicry mind mode modifications moths natural selection necessary nest never objects observations occur organic origin Papilio perfect period phenomena possess present probably produced protection prove races reason regions remarkable render resemble result savage seems seen sexes shown similar species structure supposed tail theory tints tion trees true universe variation varied varieties various whole wings