Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan, 1871 - 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 2
... become islands ; and these changes have taken place , not once merely , but perhaps hundreds , perhaps thousands of times : -That all these operations have been more or less continuous , but unequal in their progress , and during the ...
... become islands ; and these changes have taken place , not once merely , but perhaps hundreds , perhaps thousands of times : -That all these operations have been more or less continuous , but unequal in their progress , and during the ...
Page 3
... of this essay , and he has since taken every opportunity of testing it by all the newly - ascertained facts with which he has become acquainted , or has been able to observe himself . B 2 THE INTRODUCTION OF NEW SPECIES . 3.
... of this essay , and he has since taken every opportunity of testing it by all the newly - ascertained facts with which he has become acquainted , or has been able to observe himself . B 2 THE INTRODUCTION OF NEW SPECIES . 3.
Page 6
... become the antitypes from which other closely allied species were created . The effect of this would be , that so long as each species has had but one new species formed on its model , the line of affinities will be simple , and may be ...
... become the antitypes from which other closely allied species were created . The effect of this would be , that so long as each species has had but one new species formed on its model , the line of affinities will be simple , and may be ...
Page 7
... becomes an affinity . We are also made aware of the difficulty of arriving at a true classification , even in a small and perfect group ; -in the actual state of nature it is almost impossible , the species being so numerous and the ...
... becomes an affinity . We are also made aware of the difficulty of arriving at a true classification , even in a small and perfect group ; -in the actual state of nature it is almost impossible , the species being so numerous and the ...
Page 8
... becomes apparent to us . We shall thus find ourselves obliged to reject all those systems of classification which arrange species or groups in circles , as well as those which fix a definite number for the divisions of each group . The ...
... becomes apparent to us . We shall thus find ourselves obliged to reject all those systems of classification which arrange species or groups in circles , as well as those which fix a definite number for the divisions of each group . The ...
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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 adapted Amboyna anal valves animals antenn¿ appear beautiful become bees beetles believe birds Borneo brain build butterflies caterpillars causes Celebes changes character colour concealed conspicuous Crown 8vo curious Danaid¿ Darwin Diphilus direction distinct Edition eggs essay exactly existence external extinct Extra fcap facts faculties favourable Fcap flowers genera genus geological groups habits Heliconid¿ imitation India individuals inhabiting insects instinct islands Java larv¿ Lepidoptera less Malayan male materials mental mimic mimicry mode modified Moluccas moths natural selection nectary nest never observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionid¿ peculiar perfect phenomena POEMS Polydorus possess present probably produced Professor protection races reason regions remarkable render resemble savage sexes sexual sexual selection shown structure Sumatra tail theory of natural Theseus tints tion trees tropical variation varied varieties whole wings young birds
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