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 34
... individuals which is the necessary result . If now we have succeeded in establishing these two points - 1st , that the animal population of a country is generally stationary , being kept down by a periodical deficiency of food , and ...
... individuals which is the necessary result . If now we have succeeded in establishing these two points - 1st , that the animal population of a country is generally stationary , being kept down by a periodical deficiency of food , and ...
Page 84
... individuals , and found over a wide range of country . This indicates antiquity and permanence in the species , and is exactly the condition most essential both to aid in the development of the resemblance , and to increase its utility ...
... individuals , and found over a wide range of country . This indicates antiquity and permanence in the species , and is exactly the condition most essential both to aid in the development of the resemblance , and to increase its utility ...
Page 308
... individuals of the same stock vary . Now , health , strength , and long life , are the results of a harmony between the individual and the universe that surrounds it . Let us suppose that at any given moment this harmony is perfect . A ...
... individuals of the same stock vary . Now , health , strength , and long life , are the results of a harmony between the individual and the universe that surrounds it . Let us suppose that at any given moment this harmony is perfect . A ...
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