The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1898 |
도서 본문에서
57개의 결과 중 1 - 5개
페이지
... successive appearance of new species - On their different rates of change - Species once lost do not reappear- Groups of species follow the same general rules in their ap- pearance and disappearance as do single species - On extinction ...
... successive appearance of new species - On their different rates of change - Species once lost do not reappear- Groups of species follow the same general rules in their ap- pearance and disappearance as do single species - On extinction ...
1 페이지
... as the sterility of species when first crossed , and that of their hybrid offspring , cannot have been acquired , as I shall show , by the preservation of successive profitable 1 The degrees of sterility . It is an incidental result of.
... as the sterility of species when first crossed , and that of their hybrid offspring , cannot have been acquired , as I shall show , by the preservation of successive profitable 1 The degrees of sterility . It is an incidental result of.
4 페이지
... successive generations ; though Gärtner was enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that their fer ...
... successive generations ; though Gärtner was enabled to rear some hybrids , carefully guarding them from a cross with either pure parent , for six or seven , and in one case for ten generations , yet he asserts positively that their fer ...
6 페이지
... successive genera- tions of artificially fertilised hybrids , in contrast with those spontaneously self - fertilised , may , as I believe , be accounted for by too close interbreeding having been avoided . Now let us turn to the results ...
... successive genera- tions of artificially fertilised hybrids , in contrast with those spontaneously self - fertilised , may , as I believe , be accounted for by too close interbreeding having been avoided . Now let us turn to the results ...
8 페이지
... successive generation , as Gärtner believed to be the case , the fact would have been notorious to nursery- Horticulturists raise large beds of the same hy- brid , and such alone are fairly treated , for by insect agency the several ...
... successive generation , as Gärtner believed to be the case , the fact would have been notorious to nursery- Horticulturists raise large beds of the same hy- brid , and such alone are fairly treated , for by insect agency the several ...
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자주 나오는 단어 및 구문
admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists Palæozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings