The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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54개의 결과 중 1 - 5개
24 페이지
... admits the truth of the descent and modification of species , and supports this doctrine by many original observations . The first edition of this work was published on No- vember 24 , 1859 , and the second edition on January 7 , 1860 ...
... admits the truth of the descent and modification of species , and supports this doctrine by many original observations . The first edition of this work was published on No- vember 24 , 1859 , and the second edition on January 7 , 1860 ...
46 페이지
... admit that many domestic breeds must have originated in Europe ; for whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog throughout the world , which I admit are ...
... admit that many domestic breeds must have originated in Europe ; for whence otherwise could they have been derived ? So it is in India . Even in the case of the breeds of the domestic dog throughout the world , which I admit are ...
57 페이지
... admit that many of our domestic races . are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of spe- cies in a state of nature being lineal descendants of other species ? Principles of ...
... admit that many of our domestic races . are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of spe- cies in a state of nature being lineal descendants of other species ? Principles of ...
86 페이지
... admits that out of the 300 species , which will be enumerated in his Prodromus as belonging to the oak family , at least two- thirds are provisional species , that is , are not known strictly to fulfil the definition above given of a ...
... admits that out of the 300 species , which will be enumerated in his Prodromus as belonging to the oak family , at least two- thirds are provisional species , that is , are not known strictly to fulfil the definition above given of a ...
100 페이지
... admit in words the truth of the universal struggle for life , or more difficult at least I have found it so - than constantly to bear this conclusion in mind . Yet unless it be thoroughly ingrained in the mind , the whole economy of ...
... admit in words the truth of the universal struggle for life , or more difficult at least I have found it so - than constantly to bear this conclusion in mind . Yet unless it be thoroughly ingrained in the mind , the whole economy of ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young