Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1875 - 384 pages |
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Page 32
... Exactly the same laws will apply to mammals . Wild cats are prolific and have few enemies ; why then are they never as abundant as rabbits ? The only in- telligible answer is , that their supply of food is more precarious . It appears ...
... Exactly the same laws will apply to mammals . Wild cats are prolific and have few enemies ; why then are they never as abundant as rabbits ? The only in- telligible answer is , that their supply of food is more precarious . It appears ...
Page 42
... exactly like that of the centrifugal governor of the steam engine , which checks and corrects any irregularities almost before they become evident ; and in like manner no unbalanced deficiency in the animal king- dom can ever reach any ...
... exactly like that of the centrifugal governor of the steam engine , which checks and corrects any irregularities almost before they become evident ; and in like manner no unbalanced deficiency in the animal king- dom can ever reach any ...
Page 48
... Exactly the same thing has occurred with pigeons ; and in the case of rats and mice , the white variety has not been shown to be at all dependent on alteration of climate , food , or other external conditions . In many cases the wings ...
... Exactly the same thing has occurred with pigeons ; and in the case of rats and mice , the white variety has not been shown to be at all dependent on alteration of climate , food , or other external conditions . In many cases the wings ...
Page 51
... exactly harmonizes with the lichen - coloured stones among which it delights to sit , that a person may walk through a flock of them without seeing a single bird ; while in winter its white plumage is an almost equal protection . The ...
... exactly harmonizes with the lichen - coloured stones among which it delights to sit , that a person may walk through a flock of them without seeing a single bird ; while in winter its white plumage is an almost equal protection . The ...
Page 54
... exactly to resemble them , and as long as it remains quiet would certainly escape detection . Some of the geckos which cling motionless on the trunks of trees in the tropics , are of such curiously marbled colours as to match exactly ...
... exactly to resemble them , and as long as it remains quiet would certainly escape detection . Some of the geckos which cling motionless on the trunks of trees in the tropics , are of such curiously marbled colours as to match exactly ...
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 |
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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.