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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38 페이지
... Hence if man goes on select- ing , and thus augmenting , any peculiarity , he will almost certainly modify unintentionally other parts of the struc- ture , owing to the mysterious laws of correlation . The results of the various ...
... Hence if man goes on select- ing , and thus augmenting , any peculiarity , he will almost certainly modify unintentionally other parts of the struc- ture , owing to the mysterious laws of correlation . The results of the various ...
40 페이지
... Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain endeavored to discover on what decisive facts the above statement has so often and so boldly been made . There ...
... Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain endeavored to discover on what decisive facts the above statement has so often and so boldly been made . There ...
50 페이지
... Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists , and this , consider- ing their size , habits , and remarkable characters ...
... Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be unknown to ornithologists , and this , consider- ing their size , habits , and remarkable characters ...
51 페이지
... Hence the supposed extermination of so many species having similar habits with the rock - pigeon seems a very rash assumption . Moreover , the several above- named domesticated breeds have been transported to all parts of the world ...
... Hence the supposed extermination of so many species having similar habits with the rock - pigeon seems a very rash assumption . Moreover , the several above- named domesticated breeds have been transported to all parts of the world ...
68 페이지
... hence the Toulouse and the common breed , which differ only in color , that most fleeting of characters , have lately been exhibited as distinct at our poultry shows . These views appear to explain what has sometimes been noticed ...
... hence the Toulouse and the common breed , which differ only in color , that most fleeting of characters , have lately been exhibited as distinct at our poultry shows . These views appear to explain what has sometimes been noticed ...
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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