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
87개의 결과 중 1 - 3개
79 페이지
... produced than can possibly survive , there must in every case be a struggle for existence , either one individual ... produced only two seeds - and there is no plant so unproductive as this - and their seedlings next year produced two ...
... produced than can possibly survive , there must in every case be a struggle for existence , either one individual ... produced only two seeds - and there is no plant so unproductive as this - and their seedlings next year produced two ...
12 페이지
... produced , and probably never would produce , even with the pollen of the pure parents , a single fertile seed : but in some of these cases a first trace of fertility may be detected , by the pollen of one of the pure parent - species ...
... produced , and probably never would produce , even with the pollen of the pure parents , a single fertile seed : but in some of these cases a first trace of fertility may be detected , by the pollen of one of the pure parent - species ...
34 페이지
... produced under nature will assuredly have to be granted . If we turn to varieties , produced , or supposed to have been produced , under domestication , we are still in- volved in some doubt . For when it is stated , for in- stance ...
... produced under nature will assuredly have to be granted . If we turn to varieties , produced , or supposed to have been produced , under domestication , we are still in- volved in some doubt . For when it is stated , for in- stance ...
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