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 3
... geological periods . We may therefore safely infer a like gradation and natural sequence from one geological epoch to another . Now , taking this as a fair statement of the results of geological inquiry , we see that the present geo ...
... geological periods . We may therefore safely infer a like gradation and natural sequence from one geological epoch to another . Now , taking this as a fair statement of the results of geological inquiry , we see that the present geo ...
Page 13
... Geological Distribution of the Forms of Life . The phænomena of geological distribution are ex- actly analogous to those of geography . Closely allied species are found associated in the same beds , and the change from species to ...
... Geological Distribution of the Forms of Life . The phænomena of geological distribution are ex- actly analogous to those of geography . Closely allied species are found associated in the same beds , and the change from species to ...
Page 20
... geological epoch is necessarily very im- perfect . Looking at the vast numbers of species and groups that have been discovered by geologists , this may be doubted ; but we should compare their numbers not merely with those that now ...
... geological epoch is necessarily very im- perfect . Looking at the vast numbers of species and groups that have been discovered by geologists , this may be doubted ; but we should compare their numbers not merely with those that now ...
Contents
Geographical distribution dependent on Geologic Changes A | 1 |
On the Tendency of Varieties to depart indefinitely from | 26 |
Useful Variations will tend to Increase useless or hurtful Variations | 41 |
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 adapted affinity alike Amboyna anal valves animals antennæ appear Bates beautiful become bees beetles birds Borneo brilliant build butterflies caterpillars causes Celebes changes characters closely allied species common concealed curious Danaidæ Darwin Diphilus eggs equally exactly example existence extinct facts faculties favourable female birds flowers genera genus geological groups Guinea habits Heliconidæ imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Longicorn Malayan male Mimeta mimic mimicry mode modifications Moluccas moths natural selection nectary nest never nidification number of species observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar phenomena plumage Polydorus possess present probably produced protection race regions remarkable render resemble savage sexes sexual sexual selection shown similar spots structure Sumatra tail theory of natural Theseus tints tion trees tropical Tropidorhynchus variation varied varieties whole wings yellow