The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
도서 본문에서
41개의 결과 중 1 - 5개
11 페이지
... ranked by some competent judges as the descendants of aboriginally 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 aboriginally 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 ...
16 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 ...
25 페이지
... ranked at their first appearance as dis- tinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recog . nised in the increased size and beauty which we now see in the ...
... ranked at their first appearance as dis- tinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recog . nised in the increased size and beauty which we now see in the ...
34 페이지
... ranked as a variety of another , not because the inter- mediate 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 inter- mediate 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 ...
35 페이지
... ranked as distinct species by many entomologists . Even Ireland has a few animals , now generally regarded as varieties , but which have been ranked as species by some zoologists . Several experienced ornithologists consider our British ...
... ranked as distinct species by many entomologists . Even Ireland has a few animals , now generally regarded as varieties , but which have been ranked as species by some zoologists . Several experienced ornithologists consider our British ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young