 | 1861 - 716 หน้า
...these causes of change, however, man's power of accumulative selection predominates. (Pp. 44, 45.) "Nature gives successive variations; man adds them...directions useful to him. In this sense, he may be said to make for himself useful breeds." (P. 34-.) In this manner new races or varieties are produced within... | |
 | Robert Kemp Philp - 1860 - 360 หน้า
...purposes, or so beautiful in his eyes, we must, I think, look further than to mere variability. We cannot suppose that all the breeds were suddenly produced...perfect and as useful as we now see them ; indeed, in several cases, we know that this has not been their history. The key is man's power of accumulative... | |
 | 1860 - 656 หน้า
...he leaves a contrary impression in the mind of the trusting reader. " We cannot suppose," he says, "that all the breeds were suddenly produced as perfect and as useful as we now see them; indeed, in several cases, we know that this has not been their history. The key is man's power of accumulative... | |
 | 1860 - 512 หน้า
...mazes in which he henceforth continues to wander. He attributes the varieties of domestic animals to "Man's power of accumulative selection ; nature gives...adds them up in certain directions useful to him." We object to this, as altogether a partial and imperfect statement. It is not nature that gives the... | |
 | 1861 - 716 หน้า
...these causes of change, however, man's power of accumulative selection predominates. (Pp. 44, 45.) " Nature gives successive variations ; man adds them...directions useful to him. In this sense, he may be said to make for himself useful breeds." (P. 34.) In this manner new races or varieties are produced within... | |
 | Charles Darwin - 1861 - 470 หน้า
...purposes, or so beautiful in his eyes, we must, I think, look further than to mere variability. We cannot suppose that all the breeds were suddenly produced...perfect and as useful as we now see them ; indeed, in several cases, we know that this has not been their history. The key is man's power of accumulative... | |
 | Charles Darwin - 1864 - 472 หน้า
...purposes, or so beautiful in his eyes, we must, I think, look further than to mere variability. We cannot suppose that all the breeds were suddenly produced...perfect and as useful as we now see them ; indeed, in several cases, we know that this has not been their history. The key is man's power of accumulative... | |
 | Charles Darwin - 1866 - 668 หน้า
...purposes, or so beautiful in his eyes, we must, I think, look further than to mere variability. We cannot suppose that all the breeds were suddenly produced...useful as we now see them ; indeed, in many cases, wo know that this has not been their history. The key is man's power of accumulative selection : nature... | |
 | 1910 - 784 หน้า
...evidence accumulated, was convinced that the improved breeds had been obtained in this manner. He says : We can not suppose that all the breeds were suddenly...may be said to have made for himself useful breeds.' 1 Contribution VI, Laboratory Experimental Plant -breeding, Cornell University. The writer expects... | |
 | 1910 - 828 หน้า
...evidence accumulated, was convinced that the improved breeds had been obtained in this manner. He says : We can not suppose that all the breeds were suddenly...sense he may be said to have made for himself useful breeds.1 1 Contribution VI, Laboratory Experimental Plant-breeding, Cornell University. The writer... | |
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The key is man's power of accumulative selection: nature gives successive variations; man adds them up in certain directions useful to him. In this sense he may be said to have made for himself useful breeds. 
