On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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88개의 결과 중 1 - 5개
xii 페이지
... birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . 382 Homological structure of the feet of certain marsupial 518 384 520 385 521 387 ...
... birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . 382 Homological structure of the feet of certain marsupial 518 384 520 385 521 387 ...
7 페이지
... birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same condition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and ...
... birds , with the rarest exceptions , hardly ever lay fertile eggs . Many exotic plants have pollen utterly worthless , in the same condition as in the most sterile hybrids . When , on the one hand , we see domesticated animals and ...
16 페이지
... birds the head and tail touch the oil - gland is quite aborted . Several other less distinct breeds might be specified . In the skeletons of the several breeds , the development of the bones of the face in length and breadth and ...
... birds the head and tail touch the oil - gland is quite aborted . Several other less distinct breeds might be specified . In the skeletons of the several breeds , the development of the bones of the face in length and breadth and ...
17 페이지
... birds , would certainly be ranked by him as well - defined species Moreover , I do not believe that any ornithologist would in this case place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail ...
... birds , would certainly be ranked by him as well - defined species Moreover , I do not believe that any ornithologist would in this case place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail ...
18 페이지
... birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above ... bird with a rod tail and red spot on the forehead , and which 18 CHAP . L Domestic Pigeons .
... birds belonging to two or more distinct breeds are crossed , none of which are blue or have any of the above ... bird with a rod tail and red spot on the forehead , and which 18 CHAP . L Domestic Pigeons .
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young