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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vii 페이지
... — Fertility of varieties when crossed and of their mongrel offspring not universal — Hybrids and mongrels compared independently of their tertility Summary - - 234-263 CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . CONTENTS .
... — Fertility of varieties when crossed and of their mongrel offspring not universal — Hybrids and mongrels compared independently of their tertility Summary - - 234-263 CHAPTER X. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD . CONTENTS .
6 페이지
... offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is ...
... offspring are either definite or indefinite . They may be considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is ...
7 페이지
... offspring somewhat unlike their parents . I may add , that as some organisms breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily ...
... offspring somewhat unlike their parents . I may add , that as some organisms breed freely under the most unnatural conditions ( for instance , rabbits and ferrets kept in hutches ) , showing that their reproductive organs are not easily ...
10 페이지
... offspring at a corresponding age , though some- times earlier . In many cases this could not be otherwise ; thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in ...
... offspring at a corresponding age , though some- times earlier . In many cases this could not be otherwise ; thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature ; peculiarities in ...
11 페이지
... offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists ...
... offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a statement often made by naturalists ...
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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