Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1870 - 384 pages |
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Page 8
... seems to have obtained a deeper hold , many eminent naturalists having to some extent adopted it . We have , however , never been able to find a case in which the circle has been closed by a direct and close affinity . In most cases a ...
... seems to have obtained a deeper hold , many eminent naturalists having to some extent adopted it . We have , however , never been able to find a case in which the circle has been closed by a direct and close affinity . In most cases a ...
Page 14
... seem to show that there has been a general , but not a detailed pro- gression . Mollusca and Radiata existed before Ver- tebrata , and the progression from Fishes to Reptiles and Mammalia , and also from the lower mammals . to the ...
... seem to show that there has been a general , but not a detailed pro- gression . Mollusca and Radiata existed before Ver- tebrata , and the progression from Fishes to Reptiles and Mammalia , and also from the lower mammals . to the ...
Page 18
... seems no less probable that a change in the physical conditions of a district , even small in amount if rapid , or even gradual if to a great amount , would be highly unfavourable to the existence of individuals , might cause the ...
... seems no less probable that a change in the physical conditions of a district , even small in amount if rapid , or even gradual if to a great amount , would be highly unfavourable to the existence of individuals , might cause the ...
Page 19
... seems a fair assumption that during a period of geological repose the new species which we know to have been created would have appeared , that the creations would then exceed in number the extinctions , and therefore the number of ...
... seems a fair assumption that during a period of geological repose the new species which we know to have been created would have appeared , that the creations would then exceed in number the extinctions , and therefore the number of ...
Page 27
... seem quite incompatible with the " per- manent invariability of species , " but the difficulty is overcome by assuming that such varieties have strict limits , and can never again vary further from the original type , although they may ...
... seem quite incompatible with the " per- manent invariability of species , " but the difficulty is overcome by assuming that such varieties have strict limits , and can never again vary further from the original type , although they may ...
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 alike Amboyna animals antennæ appear beautiful become bees beetles birds Borneo brain brilliant build butterflies caterpillars causes Celebes changes character closely allied species colour concealed conspicuous Crown 8vo curious Darwin Diphilus distinct Edition eggs essay evidence exactly existence external extinct Extra fcap facts faculties favourable Fcap flowers genera genus geological groups Guinea habits Heliconidæ imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male Mimeta mimic mimicry mode modified Moluccas moths natural selection nectary nest never nidification number of species observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar perfect period phenomena POEMS Polydorus possess present probably produced protection race 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
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