Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1871 - 384 pages |
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Page 42
... tints may have occurred , yet those races having colours best adapted to concealment from their enemies would inevitably survive the longest . We have also here an acting cause to account for that balance so often observed in nature ...
... tints may have occurred , yet those races having colours best adapted to concealment from their enemies would inevitably survive the longest . We have also here an acting cause to account for that balance so often observed in nature ...
Page 48
... tints well suited for conceal- ment among grass and fern . But when these rabbits are domesticated , without any ... 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 ...
... tints well suited for conceal- ment among grass and fern . But when these rabbits are domesticated , without any ... 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 ...
Page 49
... tints as may best serve to enable it to es- cape from its enemies or to entrap its prey . Desert animals as a rule are desert - coloured . The lion is a typical example of this , and must be almost in- visible when crouched upon the ...
... tints as may best serve to enable it to es- cape from its enemies or to entrap its prey . Desert animals as a rule are desert - coloured . The lion is a typical example of this , and must be almost in- visible when crouched upon the ...
Page 51
... , and must be quite invisible at times when any light colour would be instantly seen . Owls and goatsuckers are of those dark mottled tints that will assimilate with bark and lichen , and thus F 2 RESEMBLANCES AMONG ANIMALS . 51.
... , and must be quite invisible at times when any light colour would be instantly seen . Owls and goatsuckers are of those dark mottled tints that will assimilate with bark and lichen , and thus F 2 RESEMBLANCES AMONG ANIMALS . 51.
Page 52
... tint which has been so far shown to exist between animals and their habitations is of a somewhat general character ; we will now consider the cases of more special adaptation . If the lion is enabled by his sandy colour readily to ...
... tint which has been so far shown to exist between animals and their habitations is of a somewhat general character ; we will now consider the cases of more special adaptation . If the lion is enabled by his sandy colour readily to ...
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 alike Amboyna anal valves animals antennæ appear Bates beautiful become bees beetles birds Borneo brilliant build butterflies caterpillars causes Celebes character closely allied species common concealed curious Danaidæ Darwin distinct eggs enemies equally exactly example existence extinct facts faculties favourable female birds flowers genera genus geological groups Guinea habits Heliconidæ imitation India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Longicorn Malayan male Mimeta mimic mimicry mode modifications Moluccas moths natural selection nectary nest never nidification number of species observations occur organic Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar phenomena plumage Polydorus possess probably produced protection race regions remarkable render resemble savage sexes sexual sexual selection shown spots structure Sumatra tail theory of natural Theseus tints tion trees tropical Tropidorhynchus variation varied varieties whole wings yellow young birds
Popular passages
Page 351 - ... the passage from the current to the needle, if not demonstrable, is thinkable, and that we entertain no doubt as to the final mechanical solution of the problem. 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...
Page 358 - If, therefore, we have traced one force, however minute, to an origin in our own WILL, while we have no knowledge of any other primary cause of force, it does not seem an improbable conclusion that all force may be will-force; and thus, that the whole universe is not merely dependent on, but actually is, the WILL of higher intelligences or of one Supreme Intelligence.
Page 28 - ... applied to high numbers, the results come nearer to what theory demands, and, as we approach to an infinity of examples, become strictly accurate. Now the scale on which nature works is so vast — the numbers of individuals and periods of time with which she deals approach so near to infinity, that any cause, however slight, and however liable to be veiled and counteracted by accidental circumstances, must in the end produce its full legitimate results.
Page 351 - ... the other. They appear together, but we do not know why. Were our minds and senses so expanded, strengthened, and illuminated as to enable us to see and feel the very molecules of the brain ; were we capable of following all their motions, all their groupings, all their electric discharges, if such there be ; and were we intimately acquainted with the corresponding states of thought and feeling, we should be as far as ever from the solution of the problem, " How are these physical processes connected...
Page 349 - A superior intelligence has guided the development of man in a definite direction and for a special purpose, just as man guides the development of many animal and vegetable forms...
Page 358 - God of the Granite and the Rose ! Soul of the Sparrow and the Bee ! The mighty tide of Being flows Through countless channels, Lord, from Thee. It leaps to life in grass and flowers, Through every grade of being runs, While from Creation's radiant towers Its glory flames in Stars and Suns.
Page 31 - The powerful retractile talons of the falcon- and the cat-tribes have not been produced or increased by the volition of those animals; but among the different varieties which occurred in the earlier and less highly organized forms of these groups, those always survived longest which had the greatest facilities for seizing their prey.
Page 16 - One of the strongest arguments which have been adduced to prove the original and permanent distinctness of species is, that varieties produced in a state of domesticity are more or less unstable, and often have a tendency, if left to themselves, to return to the normal form of the parent species; and this instability is considered to be a distinctive peculiarity of all varieties, even of those occurring among wild animals in a state of nature, and to constitute a provision for preserving unchanged...
Page 24 - ... species will present various degrees of capacity for ensuring the means of preserving life; and it is thus we account for the abundance or rarity of species. Our ignorance will generally prevent us from accurately tracing the effects to their causes; but could we become perfectly acquainted with the organization and habits of the various species of animals, and could we measure the capacity of each for performing the different acts necessary to its safety and existence under all the varying circumstances...
Page 346 - Natural Selection could only have endowed the savage with a brain a little superior to that of an ape, whereas he actually possesses one but very little inferior to that of the average members of our learned societies.