Darwiniana: EssaysD. Appleton, 1896 - 475페이지 |
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2 페이지
... varies as much as theory . Let two botanists or two zoologists examine and describe the productions of a country , and one will pretty certainly disagree with the other as to the number , limits , and definitions of the species into ...
... varies as much as theory . Let two botanists or two zoologists examine and describe the productions of a country , and one will pretty certainly disagree with the other as to the number , limits , and definitions of the species into ...
40 페이지
... a race was pro- duced , because , for several generations , care was taken to select both parents of the breeding stock from animals exhibiting a tendency to vary in the same direction ; while , in the other , no 40 II THE ORIGIN OF ...
... a race was pro- duced , because , for several generations , care was taken to select both parents of the breeding stock from animals exhibiting a tendency to vary in the same direction ; while , in the other , no 40 II THE ORIGIN OF ...
41 페이지
... vary more or less from the normal type ; and there is no variation which may not be transmitted and which , if selectively transmitted , may not become the foundation of a race . This great truth , sometimes forgotten by philosophers ...
... vary more or less from the normal type ; and there is no variation which may not be transmitted and which , if selectively transmitted , may not become the foundation of a race . This great truth , sometimes forgotten by philosophers ...
50 페이지
... vary ; and the variation may be perpetuated by selection , as a race , which race , in many cases , presents all the characteristics of a morphological species . But it is not as yet proved that a race ever exhibits , when crossed with ...
... vary ; and the variation may be perpetuated by selection , as a race , which race , in many cases , presents all the characteristics of a morphological species . But it is not as yet proved that a race ever exhibits , when crossed with ...
83 페이지
... vary indefinitely ; and secondly , from something in the surrounding world which helped all variations in the direction of an accurate time - keeper , and checked all those in other directions ; then it is obvious that the force of ...
... vary indefinitely ; and secondly , from something in the surrounding world which helped all variations in the direction of an accurate time - keeper , and checked all those in other directions ; then it is obvious that the force of ...
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adapted admit Agamogenesis Ancon animalcules animals animals and plants appears believe biological birds body called causes character Charles Darwin course creation Crustacea Darwin Darwin's views Darwinian deposited direct doctrine of evolution domestic pigeons doubt Dysteleology endeavour epigenesis epoch Erasmus Darwin evidence ex nihilo exhibited existence extinct fact favour Flourens geological germ give rise groups horse Hyæna hypothesis inorganic world inquiry kind knowledge Lamarck laws lectures less living Maillet male matter means ment Mivart modification natural selection naturalists objections observation offspring organic nature organisation Origin of Species ovum parent peculiar phenomena philosophical physiological pigeons Pikermi present primitive stock produced Quarterly Reviewer question races reason remarkable result scientific selective breeding sensations sense special creation speculations spontaneous structure Suarez substantial forms suppose Teleology tendency theory thing tion toes variation varieties vegetabilia vegetable Wallace whole
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275 페이지 - In July opened first note-book on Transmutation of Species. Had been greatly struck from about the month of previous March on character of South American fossils, and species on Galapagos Archipelago. These facts (especially latter), origin of all my views."] 1836-1837.
262 페이지 - s lectures on Geology and Zoology, but they were incredibly dull The sole effect they produced on me was the determination never as long as I lived to read a book on Geology, or in any way to study the science.
279 페이지 - I soon perceived that selection was the keystone of man's success in making useful races of animals and plants. But how selection could be applied to organisms living in a state of nature remained for some time a mystery to me.
229 페이지 - History warns us, however, that it is the customary fate of new truths to begin as heresies and to end as superstitions...
112 페이지 - The teleological and the mechanical views of nature are not, necessarily, mutually exclusive. On the contrary, the more purely a mechanist the speculator is, the more firmly does he assume a primordial molecular arrangement of which all the phenomena of the universe...
162 페이지 - And if so, it must be true, in the same sense and to the same extent, that the thoughts to which I am now giving utterance, and your thoughts regarding them, are the expression of molecular changes in that matter of life which is the source of our other vital phenomena.
25 페이지 - ... maps and in museums, but by long voyages and laborious collection; having largely advanced each of these branches of science, and having spent many years in gathering and sifting materials for his present work; the store of accurately-registered facts upon which the author of the 'Origin of Species' is able to draw at will, is prodigious.
223 페이지 - natural selection " suffices for the production of species remains to be seen. Few can doubt that, if not the whole cause, it is a very important factor in that operation ; and that it must play a great part in the sorting out of varieties into those which are transitory and those which are permanent.
247 페이지 - The hour of departure has arrived, and we go our ways — I to die, and you to live. Which is better, God only knows.
255 페이지 - Lamarck and his views on evolution. I listened in silent astonishment, and as far as I can judge without any effect on my mind. I had previously read the Zoonomia of my grandfather, in which similar views are maintained, but without producing any effect on me. Nevertheless it is probable that the hearing rather early in life such views maintained and praised may have favoured my upholding them under a different form in my Origin of Species.