Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1875 - 384 pages |
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Page 2
... appears to have occurred several times - That from the last of the geological epochs to the present or historical epoch , the change of organic life has been gradual : the first appearance of animals now existing can in many cases be ...
... appears to have occurred several times - That from the last of the geological epochs to the present or historical epoch , the change of organic life has been gradual : the first appearance of animals now existing can in many cases be ...
Page 9
... appear isolated . If in any case the antitype had an extensive range , two or more groups of species might have been formed , each varying from it in a different manner , and thus producing several representative or analogous groups ...
... appear isolated . If in any case the antitype had an extensive range , two or more groups of species might have been formed , each varying from it in a different manner , and thus producing several representative or analogous groups ...
Page 13
... appears to have been as gradual in time as in space . Geology , how- ever , furnishes us with positive proof of the extinc- tion and production of species , though it does not inform us how either has taken place . The extinction of ...
... appears to have been as gradual in time as in space . Geology , how- ever , furnishes us with positive proof of the extinc- tion and production of species , though it does not inform us how either has taken place . The extinction of ...
Page 15
... appear to some readers essentially a theory of progression , it is in reality only one of gradual change . It is , however , by no means difficult to show that a real progression in the scale of organization is perfectly consistent with ...
... appear to some readers essentially a theory of progression , it is in reality only one of gradual change . It is , however , by no means difficult to show that a real progression in the scale of organization is perfectly consistent with ...
Page 16
... appear to apply to the case of the Mollusca , which , at a very early period , had reached a high organi- zation and a great development of forms and species in the testaceous Cephalopoda . In each succeeding age modified species and ...
... appear to apply to the case of the Mollusca , which , at a very early period , had reached a high organi- zation and a great development of forms and species in the testaceous Cephalopoda . In each succeeding age modified species and ...
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 animals antennæ antitypes appear beauty become beetles believe birds Borneo brain build butterflies caterpillars causes Celebes changes character closely allied species colour concealed conspicuous Crown 8vo curious Danaidæ Darwin Diphilus distinct earth Edition eggs epoch essay exactly example existence explained extinct facts faculties favourable flowers genera genus geological geological periods groups habits Heliconidæ Illustrations imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male mimic mimicry mode modifications Moluccas moths natural selection nectary nest never nidification number of species observations occur Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar period phenomena physical Polydorus possess present probably produced Professor protection race regions remarkable render resemble savage Science sexes sexual selection shown structure Sumatra tail theory of natural Theseus tints tion TREATISE trees tropical University variation varied varieties whole wings
Popular passages
Page 361 - But the passage from the physics of the brain to the corresponding facts of consciousness is unthinkable. Granted that a definite thought and a definite molecular action in the brain occur simultaneously; we do not possess the intellectual organ, nor apparently any rudiment of the organ, which would enable us to pass, by a process of reasoning, from the one to the other.
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Page 326 - natural selection' himself, but he is actually able to take away some of that power from nature which, before his appearance, she universally exercised. We can anticipate the time when the earth will produce only cultivated plants and domestic animals ; when man's selection shall have supplanted
Page 8 - The book will doubtless find a place in the library, not only of the scientific geologist, but also of all who are desirous of the industrial progress and commercial prosperity of the Acadian provinces.