 | 1888 - 934 oldal
...producing feathers, nor a bird in the direction of producing whalebone."! Elsewhere, indeed, he says : " If variability is definite, and is determined in certain...others by conditions inherent in that which varies," even then natural selection would still continue to operate ; for " it is quite conceivable that every... | |
 | Samuel Cox, Sir William Robertson Nicoll, James Moffatt - 1882 - 536 oldal
...limits to the variation of species. Similarly he regards it as possible that further enquiries may prove '- that variability is definite, and is determined in certain directions rather than in others " — not by external circumstances alone, but — " by conditions inherent in that which varies."i... | |
 | George Park Fisher - 1883 - 524 oldal
...causes and conditions of variation," writes Professor Huxley, " have yet to be thoroughly explored ; and the importance of natural selection will not be impaired,...and is determined in certain directions rather than others by conditions inherent in that which varies. It is quite conceivable that every species tends... | |
 | George Park Fisher - 1883 - 528 oldal
...causes and conditions of variation," writes Professor Huxley, "have yet to be thoroughly explored; and the importance of natural selection will not be impaired, even if further inquiries should prove thai variability is definite, and is determined in certain directions rather than others by conditions... | |
 | 1885 - 508 oldal
...constitutional diseases (as in biology) have yet to be thoroughly explored; and further inquiry may prove " that variability is definite, and is determined.... . . " It is quite conceivable that every species of constitutional disease tends to produce varieties of a limited number and kind," and that the effect... | |
 | George Thomas Bettany - 1887 - 228 oldal
...are permanent. But the causes and conditions of variation have yet to be thoroughly explored ; and the importance of natural selection will not be impaired,...others, by conditions inherent in that which varies." We have not space to describe the importance of the work Darwin did in, or bearing on, entomology,... | |
 | George Thomas Bettany - 1887 - 224 oldal
...are permanent. But the causes and conditions of variation. J have yet to be thoroughly explored ; and the importance of natural selection will not be impaired,...determined in certain directions rather than in others, byconditions inherent in that which varies." We have not space to describe the importance of the work... | |
 | Jacob Gould Schurman - 1887 - 292 oldal
...selection, which, according to the latest statement of Professor Huxley, would operate equally well " if variability is definite, and is determined in certain...others, by conditions inherent in that which varies." And the advance in doctrine is still more strikingly illustrated when Professor Huxley goes on to say,... | |
 | Friedrich Max Müller - 1887 - 738 oldal
...permanent. . . . But the causes and conditions of variation have yet to be thoroughly explored, and the importance of natural selection will not be impaired, even if further enquiries should prove that variability is definite, and is determined in certain directions rather... | |
 | Friedrich Max Müller - 1887 - 720 oldal
...permanent. . . . But the causes and conditions of variation have yet to be thoroughly explored, and the importance of natural selection will not be impaired, even if further enquiries should prove that variability is definite, and is determined in certain directions rather... | |
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But the causes and conditions of variation have yet to be thoroughly explored, and the importance of natural selection will not be impaired, even if further enquiries should prove that variability is definite, and is determined in certain directions rather... 
