On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1870 - 440페이지 |
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123 페이지
... progenitor of the ostrich had habits like those of a bustard , and that as natural selection increased in succes ... progenitors ; for as the tarsi are almost always lost in many dang - feed- ing beetles , they must be lost early in life ...
... progenitor of the ostrich had habits like those of a bustard , and that as natural selection increased in succes ... progenitors ; for as the tarsi are almost always lost in many dang - feed- ing beetles , they must be lost early in life ...
127 페이지
... progenitors of these insects may formerly have ranged widely over the whole area . Blind species of the genus Adelops now inhabit caves , and are likewise found in dark places under moss . Far from feeling any sur- prise that some of ...
... progenitors of these insects may formerly have ranged widely over the whole area . Blind species of the genus Adelops now inhabit caves , and are likewise found in dark places under moss . Far from feeling any sur- prise that some of ...
133 페이지
... progenitor may have acquired through natural selection some one modification in structure , and , after thousands of generations , some other and independent modification ; and these two modifications , having been transmitted to a ...
... progenitor may have acquired through natural selection some one modification in structure , and , after thousands of generations , some other and independent modification ; and these two modifications , having been transmitted to a ...
139 페이지
... progenitor of the genus . This period will seldom be remote in any extreme degree , as species very rarely endure for more than one geological period . An extraordinary amount of modifica- tion implies an unusually large and long ...
... progenitor of the genus . This period will seldom be remote in any extreme degree , as species very rarely endure for more than one geological period . An extraordinary amount of modifica- tion implies an unusually large and long ...
141 페이지
... progenitor , for it can rarely have happened that natural selection will have modified several species , fitted to more or less widely - different habits , in exactly the same manner : and as these so - called generic characters have ...
... progenitor , for it can rarely have happened that natural selection will have modified several species , fitted to more or less widely - different habits , in exactly the same manner : and as these so - called generic characters have ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion variability variation vary whole widely
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423 페이지 - It is interesting to contemplate a tangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other and dependent upon each other in so complex a manner, have all been produced by laws acting around us.
422 페이지 - In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.
423 페이지 - Variability from the indirect and direct action of the conditions of life, and from use and disuse; a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms. Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of higher animals, directly follows.
9 페이지 - On my return home, it occurred to me, in 1837, that something might perhaps be made out on this question by patiently accumulating and reflecting on all sorts of facts which could possibly have any bearing on it. After five years' work I allowed myself to speculate on the subject, and drew up some short notes ; these I enlarged in 1844 into a sketch of the conclusions which then seemed to me probable : from that period to the present day I have steadily pursued the same object. I hope that I may...
423 페이지 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.
61 페이지 - I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection, in order to mark its relation to man's power of selection.
72 페이지 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
169 페이지 - If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down.
420 페이지 - Our classifications will come to be, as far as they can be so made, genealogies ; and will then truly give what may be called the plan of creation.
11 페이지 - ... species had not been independently created, but had descended, like varieties, from other species. Nevertheless, such a conclusion, even if well founded, would be unsatisfactory, until it could be shown how the innumerable species inhabiting this world have been modified, so as to acquire that perfection of structure and coadaptation which most justly excites our admiration.