 | Sir Charles Lyell - 1835 - 474 페이지
...vegetable kingdom generally, it must be recollected that even of the seeds which are well ripened, a great part are either eaten by insects, birds, and other...wild upon a hill near Turin. Ranunculus lacerus, also sterile, has been produced accidentally at Grenoble, and near Paris, by the union of two Ranunculi... | |
 | Sir Charles Lyell - 1837 - 568 페이지
...even if they were ever produced " See Barton on the Geography of Plants, p. 67. t Georg lib. iii. 273. beyond one generation in a wild state. In the universal...in which hybrids are acknowledged to be deficient. Cenlaurea hybrida, a plant which never bears seed, and is supposed to be produced by the frequent intermixture... | |
 | Stephen Edelston Toulmin, Stephen Toulmin, June Goodfield - 1982 - 292 페이지
...generalized this 'war between the plants', arguing for a 'universal struggle for existence', in which 'the right of the strongest eventually prevails; and the strength and durability of the race depends mainly on its prolificness' — Every species which has spread itself from a small... | |
 | Robert Maxwell Young - 1971 - 372 페이지
...Spencer), contains many references of this kind, including innumerable passages on struggle: for example, "In the universal struggle for existence, the right...in which hybrids are acknowledged to be deficient." Without working systematically I have seen fifteen other references to struggle in volume two alone.... | |
 | Charles Lyell - 1990 - 358 페이지
...anther-dust of its own species alight upon it, this is instantly absorbed, and the effect of the foreign pollen destroyed. Besides, it does not often happen...plant which never bears seed, and is supposed to be pi-oduced by the frequent intermixture of two well-known species of Centaurea, grows wild upon a hill... | |
 | Leslie Alan Horvitz - 2001 - 356 페이지
...had remarked on the phenomenon. There was, he said, a "universal strug• gle for existence" in which "the right of the strongest eventually prevails, and the strength and durability of the race (read species) depends mainly on its proliferations." By "proliferations," Lyell was referring... | |
 | James Brown - 2006 - 422 페이지
...his correspondence especially between himself and Lyell * the Geologist who wrote to Darwin saying, 'In the universal struggle for existence, the right of the strongest eventually prevails'. (Quoted in Young on 'The Principles'. 1969). * In 1859 Darwin wrote to Lyell about the conditions of... | |
 | 142 페이지
...growth.30 This awareness led him to comment on the "struggle for existence" in the following words : In the universal struggle for existence, the right...durability of a race depends mainly on its prolificness. . . .;il As Loren Eiseley has already shown, Darwin had encountered the idea of population pressure... | |
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If, therefore, the relative fecundity or hardiness of hybrids be in the least degree inferior, they cannot maintain their footing for many generations, even if they were ever produced beyond one generation in a wild state. In the universal struggle for... 