 | George Thomas Bettany - 1887 - عدد الصفحات: 228
...Pliny relates that their pedigree and race could be reckoned by the Romans of his time. " 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... | |
 | Jacob Gould Schurman - 1887 - عدد الصفحات: 292
...differences that may be wholly inappreciable to the uneducated eye and touch. "The key," says Darwin, "is man's power of accumulative selection ; nature gives successive variations ; man adds them np in certain directions useful to him. " Now, this mode of language (of which I have hitherto availed... | |
 | 1888 - عدد الصفحات: 1018
...life whatever form and mold he pleases." Darwin, in his Origin of Species, says cogently: " We cannot suppose that all the breeds were suddenly produced...to him. In this sense he may be said to have made himself useful breeds." How important, then, it is to make our selections accumulative; to at every... | |
 | United States. Department of Agriculture - 1888 - عدد الصفحات: 880
...pleases." Darwin, in hia Г"° -?n of Species, says cogently: "We can not suppose that all the »* -ds were suddenly produced as perfect and as useful as...to him. In this sense he may be said to have made himself useful breeds." How important, then, it is to make our selections accumulative; to at every... | |
 | Jacob Gould Schurman - 1888 - عدد الصفحات: 290
...differences that may be wholly inappreciable to the uneducated eye and touch. " The key," says Darwin, " is man's power of accumulative selection ; nature...adds them up in certain directions useful to him. " Now, this mode of language (of which I have hitherto availed myself) is not capable of misinterpretation... | |
 | United States. Department of Agriculture - 1888 - عدد الصفحات: 878
...mold he pleases." Darwin, in his Origin of Species, says cogently: "We can not suppose that all tho breeds were suddenly produced as perfect and as useful...them up in certain directions useful to him. In this souse he may be said to have made himself useful breeds." How important, then, it is to make our selections... | |
 | 1890 - عدد الصفحات: 1464
...man's use or fancy. We know that all the breeds were not produced as perfect as we now see them, and the key is man's power of accumulative selection;...nature gives successive variations; man adds them up, making for himself useful breeds. Skillful breeders speak of the organization as plastic and under... | |
 | James Iverach - 1894 - عدد الصفحات: 264
...during many generations until what looks like a new species is produced. " The key," says Darwin, " is man's power of accumulative selection ; nature...adds them up in certain directions useful to him." This kind of language is readily understood, and every one may at once see what is meant. It seems... | |
 | Charles Darwin - 1896 - عدد الصفحات: 406
...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...may be said to have made for himself useful breeds. The great power of this principle of selection is not hypothetical It is certain that several of our... | |
 | Charles Darwin - 1896 - عدد الصفحات: 408
...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...adds them up in certain directions useful to him. I In this sense he may be said to have made for himself useful breeds. The great power of this principle... | |
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