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 24
... wing adapted for flight in the scaly flapper of the penguin , and limbs first concealed beneath the skin , and then weakly protruding from it , were the necessary gra- dations before others should be formed fully adapted for locomotion ...
... wing adapted for flight in the scaly flapper of the penguin , and limbs first concealed beneath the skin , and then weakly protruding from it , were the necessary gra- dations before others should be formed fully adapted for locomotion ...
Page 31
... wing to search for it over an extensive arca , or during some season of the year it becomes very scarce , and less wholesome substitutes have to be found ; and thus , though more fertile in offspring , they can never in- crease beyond ...
... wing to search for it over an extensive arca , or during some season of the year it becomes very scarce , and less wholesome substitutes have to be found ; and thus , though more fertile in offspring , they can never in- crease beyond ...
Page 35
... wings would sooner or later be affected in its powers of procuring a regular supply of food ; and in both cases the result must neces- sarily be a diminution of the population of the modified species . If , on the other hand , any ...
... wings would sooner or later be affected in its powers of procuring a regular supply of food ; and in both cases the result must neces- sarily be a diminution of the population of the modified species . If , on the other hand , any ...
Page 42
... wings accom- panying weak feet , or great velocity making up for the absence of defensive weapons ; for it has been shown that all varieties in which an unbalanced deficiency occurred could not long continue their existence . The action ...
... wings accom- panying weak feet , or great velocity making up for the absence of defensive weapons ; for it has been shown that all varieties in which an unbalanced deficiency occurred could not long continue their existence . The action ...
Page 48
... wings of an insect not only assume the exact tint of the bark or leaf it is accustomed to rest on , but the form and veining of the leaf or the exact rugosity of the bark is imitated ; and these detailed modifications cannot be ...
... wings of an insect not only assume the exact tint of the bark or leaf it is accustomed to rest on , but the form and veining of the leaf or the exact rugosity of the bark is imitated ; and these detailed modifications cannot be ...
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 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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