 | Charles Darwin - 1861 - 470 pagina’s
...tendency to an indefinite augmentation of specific forms. Natural Selection acts, as we have seen, exclusively by the preservation and accumulation of...beneficial under the organic and inorganic conditions of life to which each creature is at each successive period exposed. The ultimate result will be that... | |
 | Charles Darwin - 1864 - 472 pagina’s
...tendency to an indefinite augmentation of specific forms. Natural Selection acts, as we have seen, exclusively by the preservation and accumulation of...beneficial under the organic and inorganic conditions of life to which each creature is at each successive period exposed. The ultimate result will be that... | |
 | Charles Darwin - 1866 - 668 pagina’s
...inorganic conditions of life to which each creature has been exposed at each successive period of time. The ultimate result is that each creature tends to...more and more improved in relation to its conditions of life. This improvement inevitably leads to the gradual advancement of the organisation of the greater... | |
 | Alexander Wilford Hall - 1880 - 544 pagina’s
...natural selection, which only acts on useful variations. I will quote here but two passages. He says: — "Natural selection acts exclusively by the preservation...accumulation of variations which are beneficial." " Natural selection acts only by the preservation and accumulation of small inherited modifications,... | |
 | Alexander Wilford Hall - 1883 - 552 pagina’s
...produce no great sudden modifications [such as a useful wing]; it can act only by short and slow steps." "Natural selection acts exclusively by the preservation and accumulation of variations which are Itneficial." — DARWIN, Origin of Species, pp. 97, 156, 180, 413. The reader can not misunderstand... | |
 | James Samuelson, Sir William Crookes - 1881 - 782 pagina’s
...variations occur ;" that is, favourable to the development of new species. Natural selection, he observes, acts exclusively "by the preservation and accumulation...beneficial under the organic and inorganic conditions of life to which each creature is at each successive period exposed." Hence Mr. Darwin consigns the... | |
 | 1881 - 836 pagina’s
...variations occur ;" that is, favourable to the development of new species. Natural selection, he observes, acts exclusively "by the preservation and accumulation...beneficial under the organic and inorganic conditions of life to which each creature is at each successive period exposed." Hence Mr. Darwin consigns the... | |
 | Charles Darwin - 1882 - 494 pagina’s
...orders, and classes, as at the present time. On Me Dtgree to wliich Organisation tends to advance. Natural Selection acts exclusively by the preservation and accumulation of variations, which arc beneficial under the organic and inorganic conditions to which each creature is exposed at all... | |
 | 1891 - 208 pagina’s
...useless but absolutely injurious during numberless generations of incipiency, forreasons given. As "natural selection acts exclusively by the preservation and accumulation of variations which are benefl'"ia/"and " the destrttction of those which are injurious," it could have done nothing toward... | |
 | Joseph Smith Van Dyke - 1886 - 494 pagina’s
...successive variations." "Natural selection acts solely by accumulating slight favorable variations." " Natural selection acts exclusively by the preservation...accumulation of variations which are beneficial." " Every variation which is not inherited is unimportant for us." " Natural selection acts only by the... | |
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Natural selection acts exclusively by the preservation and accumulation of variations, which are beneficial under the organic and inorganic conditions to which each creature is exposed at all periods of life. The ultimate result is that each creature... 
