| Charles Darwin - 1896 - 408 páginas
...orders, and classes, as at the present time. On the Degree to which Organisation tends to advance. 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.... | |
| Jabez Thomas Sunderland, Brooke Herford, Frederick B. Mott - 1897 - 604 páginas
...repetition of the uncommon, of that which the gardener would call a "sport." Or, as Darwin puts it, "natural selection acts only by the preservation and...modifications, each profitable to the preserved being." exceptional bud which a plant throws out, we know not why. He was that exceptional throw of nature's... | |
| John Clark Ridpath - 1898 - 584 páginas
...in explaining the excavation of the deepest valleys or the formation of long lines of inland cliffs. Natural selection acts only by the preservation and...modifications, each profitable to the preserved being ; and as modern geology has almost banished such views as the excavation of a "T^at valley by a single... | |
| John Clark Ridpath - 1899 - 544 páginas
...in explaining the excavation of the deepest valleys or the formation of long lines of inland cliffs. Natural selection acts only by the preservation and...modifications, each profitable to the preserved being ; and as modern geology has almost banished such views as the excavation of a great valley by a single... | |
| William Keith Brooks - 1899 - 356 páginas
...survive, but only why the unfit are exterminated. "Natural selection," says Darwin ("Origin," p. 75), "acts only by the preservation and accumulation of...modifications, each profitable to the preserved being." This has seemed, and still seems, to many, a valid reason for questioning its value as a scientific... | |
| William Keith Brooks - 1899 - 356 páginas
...why the unfit are exterminated. "Natural selection," says Darwin ("Origin," p. 75), "acts only 183 by the preservation and accumulation of small inherited...modifications, each profitable to the preserved being." This has seemed, and still seems, to many, a valid reason for questioning its value as a scientific... | |
| David Josiah Brewer - 1900 - 462 páginas
...in explaining the excavation of the deepest valleys or the formation of long lines of inland cliffs. Natural selection acts only by the preservation and...modifications, each profitable to the preserved being; and as modern geology has almost banished such views as the excavation of a great valley by a single... | |
| David Josiah Brewer - 1902 - 448 páginas
...in explaining the excavation of the deepest valleys or the formation of long lines of inland cliffs. Natural selection acts only by the preservation and...modifications, each profitable to the preserved being; and as modern geology has almost banished such view* as the excavation of a great valley by a single... | |
| Charles Darwin - 1902 - 238 páginas
...in explaining the excavation of the deepest valleys or the formation of long lines of inland cliffs. Natural selection acts only by the preservation and...modifications, each profitable to the preserved being; and as modern geology has almost banished such views as the excavation of a great valley by a single... | |
| Benjamin Kidd - 1902 - 588 páginas
...in which this fact is brought out clearly are numerous. Natural Selection, we are told in chap, iv., "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."... | |
| |