Contributions to the Theory of Natural Selection: A Series of EssaysMacmillan and Company, 1870 - 384 pages |
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Page 4
... 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 almost invariably ...
... 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 almost invariably ...
Page 5
... genera and species of the one are often represented by closely allied families , genera and species peculiar to the other . Geology . 5. The distribution of the organic world in time is very similar to its present distribution in space ...
... genera and species of the one are often represented by closely allied families , genera and species peculiar to the other . Geology . 5. The distribution of the organic world in time is very similar to its present distribution in space ...
Page 7
... genera or families . These are the parallel series or representative groups of naturalists , and they often occur in different countries , or are found fossil in different formations . They are said . to have an analogy to each other ...
... genera or families . These are the parallel series or representative groups of naturalists , and they often occur in different countries , or are found fossil in different formations . They are said . to have an analogy to each other ...
Page 9
... genera , and whole families peculiar to it , will be the neces- sary result of its having been isolated for a long period , sufficient for many series of species to have been created on the type of pre - existing ones , which , as well ...
... genera , and whole families peculiar to it , will be the neces- sary result of its having been isolated for a long period , sufficient for many series of species to have been created on the type of pre - existing ones , which , as well ...
Page 11
... genera occurring , and even whole genera being peculiar to one side only , as is remarkably seen in the case of the Andes and Rocky Mountains . A similar phænomenon occurs when an island has been separated from a continent at a very ...
... genera occurring , and even whole genera being peculiar to one side only , as is remarkably seen in the case of the Andes and Rocky Mountains . A similar phænomenon occurs when an island has been separated from a continent at a very ...
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 action adapted affinity animals antennæ antitypes appear beautiful become beetles birds Borneo brain brilliant build butterflies carnivora caterpillars causes Celebes changes character closely allied species colour concealed consider conspicuous curious Danaidæ Darwin Diphilus distinct earth eggs epoch evidence exactly existence explained extinct facts faculties favourable female birds flowers genera genus geological geological periods groups habits Heliconidæ imitation increase India individuals inhabiting insects instinct islands Java larvæ Lepidoptera less Malayan male mimic mimicry mode modified Moluccas moths natural selection nectary nest never nidification number of species observations occur organic world Origin of Species Ormenus Pammon Papilio Papilio Ulysses Papilionidæ peculiar period phenomena Polydorus possess present probably produced protection race regions remarkable render resemble result savage sexes sexual sexual selection shown structure Sumatra supposed tail theory of natural Theseus tints tion trees tropical variation varied varieties whole wings
Popular passages
Page 361 - 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...
Page 325 - ... to capture or overcome both. Though less capable than most other animals of living on the herbs and the fruits that unaided nature supplies, this wonderful faculty taught him to govern and direct nature to his own benefit, and make her produce food for him, when and where he pleased. From...
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, Till from Creation's radiant towers Its glory flames in stars and suns.
Page 38 - ... 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...
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 41 - ... but the view here developed renders such an hypothesis quite unnecessary, by showing that similar results must be produced by the action of principles constantly at work in nature.
Page 39 - ... dangers, in procuring shelter from the inclemency of the seasons, and in providing for the subsistence and safety of its offspring. There is no muscle of its body that is not called into daily and hourly activity ; there is no sense or faculty that is not strengthened by continual exercise. The domestic animal, on the other hand, has food provided for it, is sheltered, and often confined, to guard it against the vicissitudes of the seasons, is carefully secured from the attacks of its natural...
Page 343 - ... prepared in advance, only to be fully utilized as he progresses in civilization. A brain slightly larger than that of the gorilla would, according to the evidence before us, fully have sufficed for the limited mental development of the savage ; and we must therefore admit, that the large brain he actually possesses could never have been solely develope.d by any of those laws of evolution, whose essence is, that they lead to a degree of organization exactly proportionate to the wants of each species,...
Page 336 - And assuredly, there is no mark of degradation about any part of its structure. It is, in fact, a fair average human skull, which might have belonged to a philosopher, or might have contained the thoughtless brains of a savage.
Page iv - Far abler men than myself may confess that they have not that untiring patience in accumulating, and that wonderful skill in using, large masses of facts of the most varied kind...