The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página 3
... modification and coadaptation . At the com- mencement of my observations it seemed to me probable that a careful study ... modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ...
... modification and coadaptation . At the com- mencement of my observations it seemed to me probable that a careful study ... modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ...
Página 6
... modified in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt about many slight changes , -such ...
... modified in the same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt about many slight changes , -such ...
Página 21
... modified to a large extent their breeds of cattle and sheep . In order fully to realise what they have done , it is ... modify the character of his flock , but to change it altogether . It is the magician's wand , by means of which he ...
... modified to a large extent their breeds of cattle and sheep . In order fully to realise what they have done , it is ... modify the character of his flock , but to change it altogether . It is the magician's wand , by means of which he ...
Página 24
... modify any breed , in the same way as Bakewell , Collins , etc. , by this very same process , only carried on more ... modified to a large extent since the time of that monarch . Some highly competent authorities are convinced that the ...
... modify any breed , in the same way as Bakewell , Collins , etc. , by this very same process , only carried on more ... modified to a large extent since the time of that monarch . Some highly competent authorities are convinced that the ...
Página 40
... modified , still inherit those advantages that enabled their parents to become dominant over their compatriots . In these remarks on predominance , it should be understood that reference is made only to the forms which come into ...
... modified , still inherit those advantages that enabled their parents to become dominant over their compatriots . In these remarks on predominance , it should be understood that reference is made only to the forms which come into ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 occur 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 tend theory tion variability variations varieties vary whilst whole wings young