Darwinia: Essays and Reviews Pertaining to DarwinismD. Appleton, 1877 - Всего страниц: 404 |
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Стр. 12
... vary more or less , and some vary remarkably - partly from the influence of altered cir- cumstances , and partly ( and more really ) from un- known constitutional causes which altered conditions favor rather than originate . But these ...
... vary more or less , and some vary remarkably - partly from the influence of altered cir- cumstances , and partly ( and more really ) from un- known constitutional causes which altered conditions favor rather than originate . But these ...
Стр. 15
... vary , they have suf- ficed even to modify the species themselves and pro- duce the present diversity . Mr. Agassiz believes that they have not even affected the geographical range and the actual association of species , still less ...
... vary , they have suf- ficed even to modify the species themselves and pro- duce the present diversity . Mr. Agassiz believes that they have not even affected the geographical range and the actual association of species , still less ...
Стр. 25
... vary some of the natural conditions of a species , and thus learn experi- mentally what changes are within the reach of vary ing conditions in Nature . We separate and protect a THE ORIGIN OF SPECIES . 25.
... vary some of the natural conditions of a species , and thus learn experi- mentally what changes are within the reach of vary ing conditions in Nature . We separate and protect a THE ORIGIN OF SPECIES . 25.
Стр. 26
... vary ; and that , when it has once begun to vary , its varieties are not the less but the more sub- ject to variation . " No case is on record of a variable being ceasing to be variable under cultivation . " It is fair to conclude ...
... vary ; and that , when it has once begun to vary , its varieties are not the less but the more sub- ject to variation . " No case is on record of a variable being ceasing to be variable under cultivation . " It is fair to conclude ...
Стр. 27
... vary on an average as largely as the parent species of our existing domesticated productions have varied . ” As to amount of variation , there is the common remark of naturalists that the varieties of domesti- cated plants or animals ...
... vary on an average as largely as the parent species of our existing domesticated productions have varied . ” As to amount of variation , there is the common remark of naturalists that the varieties of domesti- cated plants or animals ...
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adaptation Agassiz American ammonia appears argument atheistic bald cypress botanists bristles Candolle Charles Darwin Cloth common connection creation Cretaceous Darwin Darwinian derivation digestion Dionæa direct divine doctrine Drosera Europe evidence evolution existence explain extinct facts favor final causes flies force forms fossil genera genus geological glands Glyptostrobus gradations ground Hodge human hypothesis idea illustration individuals inference insects instance Japan laws leaf leaves less Linnæus living manifested matter means ment mind miocene movement natural history natural selection natural theology naturalists nebular hypothesis North organic origin of species peculiar pepsin perhaps philosophical phyllotaxis physical pitchers plants and animals present principle probably produced Prof question races redwoods regard region remarkable Sarracenia scientific secretion seems Sequoia succession sundew suppose Taxodium teleology tentacles tertiary theistic theory things thought tion tive trees variation varieties vary vegetable whole
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Стр. 131 - And God said, Let the earth bring forth the living creature after his kind, cattle, and creeping thing, and beast of the earth after his kind: and it was so.
Стр. 2 - Our Place among Infinities: A Series of Essays contrasting our Little Abode in Space and Time with the Infinities Around us. Crown 8vo, cloth extra, 6s. The Expanse of Heaven : A Series of Essays on the Wonders of the Firmament.
Стр. 38 - There is no exception to the rule that every organic being naturally increases at so high a rate, that if not destroyed, the earth would soon be covered by the progeny of a single pair.
Стр. 38 - We behold the face of nature bright with gladness, we often see superabundance of food ; we do not see, or we forget, that the birds which are idly singing round us mostly live on insects or seeds, and are thus constantly destroying life ; or we forget how largely these songsters, or their eggs, or their nestlings, are destroyed by birds and beasts of prey...
Стр. 276 - My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
Стр. 396 - XVIII. The Nature of Light: With a General Account of Physical Optics.
Стр. 18 - The green and budding twigs may represent existing species; and those produced during each former year may represent the long succession of extinct species. At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have tried to overmaster other species in the great battle for life.
Стр. 395 - II. Physics and Politics ; or, Thoughts on the Application of the Principles of "Natural Selection " and " Inheritance
Стр. 104 - I can entertain no doubt, after the most deliberate study and dispassionate judgment of which I am capable, that the view which most naturalists until recently entertained, and which I formerly entertained, namely, that each species has been independently created, is erroneous. I am fully convinced that species are not immutable...
Стр. 104 - ... been stated that I attribute the modification of species exclusively to natural selection, I may be permitted to remark that in the first edition of this work, and subsequently, I placed in a most conspicuous position — namely, at the close of the Introduction the following words : "I am convinced that natural selection has been the main but not the exclusive means of modification.