Darwiniana: Essays and Reviews Pertaining to DarwinismD. Appleton, 1889 - 396 páginas |
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Página 18
... produced during each former year may represent the long succession of extinct spe- cies . At each period of growth all the growing twigs have tried to branch out on all sides , and overtop and kill the sur- rounding twigs and branches ...
... produced during each former year may represent the long succession of extinct spe- cies . At each period of growth all the growing twigs have tried to branch out on all sides , and overtop and kill the sur- rounding twigs and branches ...
Página 23
... of which must be to produce the present diversity of species and their actual relations ; or , 2 . To show the general conformity of the whole body of facts to such assumption , and also to adduce instances THE ORIGIN OF SPECIES . 23.
... of which must be to produce the present diversity of species and their actual relations ; or , 2 . To show the general conformity of the whole body of facts to such assumption , and also to adduce instances THE ORIGIN OF SPECIES . 23.
Página 30
... produce its own like ; whose pro- geny again is almost sure to produce its like , since it is much the same whether it takes after its mother or its grandmother . In this way races arise , which under favorable con- ditions may be as ...
... produce its own like ; whose pro- geny again is almost sure to produce its like , since it is much the same whether it takes after its mother or its grandmother . In this way races arise , which under favorable con- ditions may be as ...
Página 31
... produced in new breeds of cattle , sheep , and poultry , and new varieties of fruit of greater and greater size or excellence . It is said that all domestic varieties , if left to run wild , would revert to their aboriginal stocks ...
... produced in new breeds of cattle , sheep , and poultry , and new varieties of fruit of greater and greater size or excellence . It is said that all domestic varieties , if left to run wild , would revert to their aboriginal stocks ...
Página 38
... produced only two seeds - and there is no plant so unproductive as this — and their seedlings next year pro- duced two , and so on , then in twenty years there would be a million plants . The elephant is reckoned to be the slowest ...
... produced only two seeds - and there is no plant so unproductive as this — and their seedlings next year pro- duced two , and so on , then in twenty years there would be a million plants . The elephant is reckoned to be the slowest ...
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Términos y frases comunes
action adaptation Agassiz appears argument atheistic auroch bald cypress botanists Candolle Charles Darwin common conclusion connection creation crystalline lens Darwin Darwin's theory Darwinian derivation descendants Dionæa direct divine doctrine doubt Drosera equally evidence of design evolution existence explain extinct facts favor final causes force forms fossil genera genus geographical geological glands Glyptostrobus gradation ground human hypothesis idea illustration individuals inference insects instance laws least leaves less Linnæus living matter means ment mind miocene natural history natural selection natural theology naturalists nebular hypothesis object observation origin of species particular peculiar perhaps philosophical phyllotaxis physical plants and animals present principle probably produced proof prove question races reason regard region remarks reviewer Sarracenia scientific seems sense Sequoia sort structure succession sundew supernatural suppose Taxodium teleology tentacles tertiary theistic things thought tion tive trees types variation varieties vary vegetable whole
Pasajes populares
Página 129 - 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.
Página 396 - ON SOUND : A Course of Eight Lectures delivered at the Royal Institution of Great Britain.
Página 274 - My substance was not hid from thee, when I was made in secret, and curiously wrought in the lowest parts of the earth.
Página 16 - ... of the former and present buds by ramifying branches may well represent the classification of all extinct and living species in groups subordinate to groups. Of the many twigs which flourished when the tree was a mere bush, only two or three, now grown into great branches, yet survive and bear the other branches; so with the species which lived during long-past geological periods, very few have left living and modified descendants.
Página 16 - 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.
Página 102 - 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...
Página 102 - ... 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.