 The direct action of changed conditions leads to definite or indefinite results. In the latter case the organisation seems to become plastic, and we have much fluctuating variability. In the former case the nature of the organism is such that it yields...  The American Naturalist - Page 1411909Full view - About this book
 | Charles Darwin - 1873 - 492 pages
...on the whole organisation or on certain parts alone, and indirectly through the reproductive system. In all cases there are two factors, the nature of...definite or indefinite results. In the latter case the organisation seems to become plastic, and we have much fluctuating variability. In the former case... | |
 | Charles Darwin - 1875 - 504 pages
...on the whole organisation or on certain parts alone, and indirectly through the reproductive system. In all cases there are two factors, the nature of...definite or indefinite results. In the latter case the organisation seems to become plastic, and we have much fluctuating variability. In the former case... | |
 | Royal Society of Edinburgh - 1889 - 630 pages
...on the whole organisation or on certain parts alone, and indirectly through the reproductive system. In all cases there are two factors, the nature of...important of the two, and the nature of the conditions "Whatever the cause may be of each slight difference between the offspring and their parents, — and... | |
 | 1894 - 528 pages
...indefinite " — which Mr. Wallace says he does not understand — from Darwin himself, who says : " The direct action of changed conditions leads to definite or indefinite results ; " ' while of the former he writes : " By the term definite action, I mean an action of such a nature... | |
 | Charles Darwin - 1896 - 408 pages
...on the whole organisation or on certain parts alone, and indirectly through the reproductive system. In all cases there are two factors, the nature of...definite or indefinite results. In the latter case the organisation seems to become plastic, and we have much fluctuating variability. In the former case... | |
 | Charles Darwin - 1896 - 406 pages
...on the whole organisation or on certain parts alone, and indirectly through the reproductive system. In all cases there are two factors, the nature of the organism, which ia much the most important of the two, and the nature of the conditions. The direct action of changed... | |
 | 1898 - 82 pages
...indefinite' — which Mr. Wallace says he does not understand — from Darwin himself, who says : ' The direct action of changed conditions leads to definite or indefinite results ' ; while of the former he writes : ' By the term definite action, I mean an action of such a nature... | |
 | Walter Warren Seton - 1903 - 168 pages
...response to, and direct adaptation to the conditions of life. Darwin thus describes the process : — " The direct action of changed conditions leads to definite or indefinite results. ... In the former case the nature of the organism is such that it yields readily when subjected to certain conditions,... | |
 | Daniel Coit Gilman, Harry Thurston Peck, Frank Moore Colby - 1904 - 1218 pages
..."to acknowledge plainly our ignorance of the cause of each particular variation;" nnd he states that "the direct action of changed conditions leads to definite or indefinite results." But it is more probable that, though variations may in some cases seem to be fortuitous, in general... | |
 | Daniel Coit Gilman, Harry Thurston Peck, Frank Moore Colby - 1906 - 938 pages
...par- fr .° m ' "** raav )m P ress themselves with peculiar ticular variation;" and he states that J*7 7P .j2 K :m^ pI = Mg k c 0 V B x <I EY ը DF 1ie But it is more probable that, though variations may in some cases seem to be fortuitous, in general... | |
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