Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1870 - 384 pages |
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Page 17
... greater part of the genera and families also dis- appear to be replaced by new ones . It is almost universally admitted that such a change in the organic world must have occupied a vast period of time . Of this interval we have no ...
... greater part of the genera and families also dis- appear to be replaced by new ones . It is almost universally admitted that such a change in the organic world must have occupied a vast period of time . Of this interval we have no ...
Page 20
... greater . Now we know that there have been many complete changes of species ; new sets of organisms have many times been introduced in place of old ones which have become extinct , so that the total amount which have existed on the ...
... greater . Now we know that there have been many complete changes of species ; new sets of organisms have many times been introduced in place of old ones which have become extinct , so that the total amount which have existed on the ...
Page 28
... the wild asses of the Tartarian deserts cannot equal in numbers the horses of the more luxuriant prairies and pampas of America . The greater or less fecundity of an animal is often con- 28 ON THE TENDENCY OF VARIETIES TO DEPART.
... the wild asses of the Tartarian deserts cannot equal in numbers the horses of the more luxuriant prairies and pampas of America . The greater or less fecundity of an animal is often con- 28 ON THE TENDENCY OF VARIETIES TO DEPART.
Page 29
A Series of Essays Alfred Russel Wallace. greater or less fecundity of an animal is often con- sidered to be one of the chief causes of its abun- dance or scarcity ; but a consideration of the facts will show us that it really has little ...
A Series of Essays Alfred Russel Wallace. greater or less fecundity of an animal is often con- sidered to be one of the chief causes of its abun- dance or scarcity ; but a consideration of the facts will show us that it really has little ...
Page 34
... might , by rendering them more or less distinguishable , affect their safety ; a greater or less development of hair might modify their habits . More important changes , power 34 ON THE TENDENCY OF VARIETIES TO DEPART.
... might , by rendering them more or less distinguishable , affect their safety ; a greater or less development of hair might modify their habits . More important changes , power 34 ON THE TENDENCY OF VARIETIES TO DEPART.
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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 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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