The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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12 페이지
... ranked by some competent judges as the descendants of aborigi- nally distinct species , and by other competent judges as mere varieties . If any well marked distinction existed between a domestic race and a species , this source of ...
... ranked by some competent judges as the descendants of aborigi- nally distinct species , and by other competent judges as mere varieties . If any well marked distinction existed between a domestic race and a species , this source of ...
17 페이지
... ranked by him as well - defined species Moreover , I do not believe that any ornithologist would in this case place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more ...
... ranked by him as well - defined species Moreover , I do not believe that any ornithologist would in this case place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more ...
26 페이지
... ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recognised in the increased size and beauty which we now see in 26 CHAP ...
... ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recognised in the increased size and beauty which we now see in 26 CHAP ...
36 페이지
... ranking the most common , but sometimes the one first described , as the species , and the cther as the variety . But cases of great difficulty , which I will not here enumerate , sometimes arise in deciding whether or not to rank one ...
... ranking the most common , but sometimes the one first described , as the species , and the cther as the variety . But cases of great difficulty , which I will not here enumerate , sometimes arise in deciding whether or not to rank one ...
37 페이지
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young