The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
도서 본문에서
82개의 결과 중 1 - 3개
43 페이지
... closely similar to other forms , or are so closely linked to them by intermediate gradations , that naturalists do not like to rank them as distinct species , are in several respects the most important for us . We have every reason to ...
... closely similar to other forms , or are so closely linked to them by intermediate gradations , that naturalists do not like to rank them as distinct species , are in several respects the most important for us . We have every reason to ...
55 페이지
... closely allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr. H. C. Watson has marked for me in the well - sifted London catalogue of Plants ( 4th edition ) sixty - three ...
... closely allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr. H. C. Watson has marked for me in the well - sifted London catalogue of Plants ( 4th edition ) sixty - three ...
239 페이지
... closely allied together that it is difficult to distinguish not a few of them . On every continent , in proceeding from north to south , from lowland to upland , etc. , we meet with a host of closely related or representative species ...
... closely allied together that it is difficult to distinguish not a few of them . On every continent , in proceeding from north to south , from lowland to upland , etc. , we meet with a host of closely related or representative species ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced 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 oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young