Contributions to the Theory of Natural Selection |
From inside the book
Page xiv
tions to Mr. Bates' Theory of Mimicry—Mimicry by Female Insects only—Cause of
the dull Colours of Female Birds—Use of the gaudy Colours of many Caterpillars
—Summary—General deductions as to Colour in Nature—Conclusion . e o e .
tions to Mr. Bates' Theory of Mimicry—Mimicry by Female Insects only—Cause of
the dull Colours of Female Birds—Use of the gaudy Colours of many Caterpillars
—Summary—General deductions as to Colour in Nature—Conclusion . e o e .
Page xv
Laws from which the Origin of Species may be deduced—Mr. Darwin's
Metaphors liable to Misconception—A case of Orchis-structure explained by
Natural Selection—Adaptation brought about by General Laws—Beauty in
Nature—How new ...
Laws from which the Origin of Species may be deduced—Mr. Darwin's
Metaphors liable to Misconception—A case of Orchis-structure explained by
Natural Selection—Adaptation brought about by General Laws—Beauty in
Nature—How new ...
Page 4
In widely distributed families the genera are often limited in range; in widely
distributed genera, well marked groups of species are peculiar to each
geographical district. 3. When a group is confined to one district, and is rich in
species, it is ...
In widely distributed families the genera are often limited in range; in widely
distributed genera, well marked groups of species are peculiar to each
geographical district. 3. When a group is confined to one district, and is rich in
species, it is ...
Page 5
In countries of a similar climate, but separated by a wide sea or lofty mountains,
the families, genera and species of the one are often represented by closely
allied families, genera and species peculiar to the other. Geology. 5. The
distribution ...
In countries of a similar climate, but separated by a wide sea or lofty mountains,
the families, genera and species of the one are often represented by closely
allied families, genera and species peculiar to the other. Geology. 5. The
distribution ...
Page 7
There constantly occur two or more modifications of an organ or modifications of
two distinct organs, leading us on to two distinct series of species, which at length
differ so much from each other as to form distinct genera or families. These are ...
There constantly occur two or more modifications of an organ or modifications of
two distinct organs, leading us on to two distinct series of species, which at length
differ so much from each other as to form distinct genera or families. These are ...
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action adapted allied animals appear beauty become believe birds body build butterflies causes changes character closely colour common comparatively complete consider conspicuous continually direction distinct doubt earth effect equally evidence exactly example existence explain extinct facts female flowers forces further genera genus geological give given greater groups habits imitation important increase individuals inhabiting insects instinct islands kind known less limited living male materials matter means mimicry mind mode modifications moths natural selection necessary nest never objects observations occur organic origin Papilio perfect period phenomena possess present probably produced protection prove race reason regions remarkable render resemble result savage seems sexes shown similar species structure supposed theory tints tion trees true universe variation varied varieties various whole wings young
Popular passages
Page 368 - 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 25 - Every species has come into existence coincident both in time and space with a preexisting closely allied species," Connects together and renders intelligible a vast number of independent and hitherto unexplained facts.
Page 35 - Even a change of colour 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, such as an increase in the power or dimensions of the limbs or any of the external organs, would more or less affect their mode of procuring food or the range of country which they inhabit.
Page 286 - Strictly speaking, therefore, Mr. Darwin's theory is not a theory on the Origin of Species at all, but only a theory on the causes which lead to the relative success or failure of such new forms as may be born into the world.
Page 38 - ... 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 359 - 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 26 - 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 356 - 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.
Page 30 - ... annually, — a striking result, but one which seems at least highly probable, and is perhaps under rather than over the truth. It would therefore appear that, as far as the continuance of the species and the keeping up the average number of individuals are concerned, large broods are superfluous. On the average all above one become food for hawks and kites, wild cats and weasels, or perish of cold and hunger as winter comes on.
Page 368 - 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.
Bibliographic information
| Title | Contributions to the Theory of Natural Selection |
| Author | Alfred Russel Wallace |
| Published | 1871 |
| Original from | the University of Michigan |
| Digitized | 17 veeb. 2006 |
| Export Citation | BiBTeX EndNote RefMan |