The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
도서 본문에서
64개의 결과 중 1 - 3개
224 페이지
... look exclusively to its lineal progenitors ; but this is scarcely ever possible , and we are forced to look to other species and genera of the same group , that is to the collateral descendants from the same parent - form , in order to ...
... look exclusively to its lineal progenitors ; but this is scarcely ever possible , and we are forced to look to other species and genera of the same group , that is to the collateral descendants from the same parent - form , in order to ...
133 페이지
... look to the waters , and we do not find the beaver or musk - rat , but the coypu and capybara , ro- dents of the S. American type . Innumerable other instances could be given . If we look to the islands off the American shore , however ...
... look to the waters , and we do not find the beaver or musk - rat , but the coypu and capybara , ro- dents of the S. American type . Innumerable other instances could be given . If we look to the islands off the American shore , however ...
284 페이지
... look , for instance , at the logger - headed duck , which has wings incapable of flight , in nearly the same condition as in the domestic duck ; or when we look at the burrowing tucu - tucu , which is occasionally blind , and then at ...
... look , for instance , at the logger - headed duck , which has wings incapable of flight , in nearly the same condition as in the domestic duck ; or when we look at the burrowing tucu - tucu , which is occasionally blind , and then at ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings