The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1895 - 432페이지 |
도서 본문에서
59개의 결과 중 1 - 5개
18 페이지
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of ... allied . With these exceptions ( and with that of the perfect fertility of varieties when crossed , -a subject hereafter ...
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of ... allied . With these exceptions ( and with that of the perfect fertility of varieties when crossed , -a subject hereafter ...
19 페이지
... closely allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
... closely allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
36 페이지
... closely allied sub - breeds . And when a cross has been made , the closest selection is far more indispensable even than in ordinary cases . If selection consisted merely in sepa- rating some very distinct variety , and breeding from it ...
... closely allied sub - breeds . And when a cross has been made , the closest selection is far more indispensable even than in ordinary cases . If selection consisted merely in sepa- rating some very distinct variety , and breeding from it ...
56 페이지
... closely resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archipelago . Thus also with ants , the several worker - castes are generally quite distinct ; but in some cases , as we shall hereafter ...
... closely resemble the two forms of an allied dimorphic species inhabiting another part of the Malay archipelago . Thus also with ants , the several worker - castes are generally quite distinct ; but in some cases , as we shall hereafter ...
60 페이지
... closely allied organisms , which inhabit distinct continents or islands . When , on the other hand , an animal or plant ranges over the same 60 [ CHAP . II DOUBTFUL SPECIES .
... closely allied organisms , which inhabit distinct continents or islands . When , on the other hand , an animal or plant ranges over the same 60 [ CHAP . II DOUBTFUL SPECIES .
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced 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 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 theory tion trees variability variations varieties vary whilst whole wings young