On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página v
... climate - Protection from the number of individuals— Complex relations of all animals and plants throughout nature— Struggle for life most severe between individuals and varieties of the same species : often severe between species of ...
... climate - Protection from the number of individuals— Complex relations of all animals and plants throughout nature— Struggle for life most severe between individuals and varieties of the same species : often severe between species of ...
Página viii
... climate and of the level of the land , and by occasional means --Dispersal during the Glacial period Alternate Glacial periods in - the north and south .. 316-342 ― CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of ...
... climate and of the level of the land , and by occasional means --Dispersal during the Glacial period Alternate Glacial periods in - the north and south .. 316-342 ― CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of ...
Página xv
... climate , this would at length become the most prevalent , if not the only race , in the particular country in which it had originated . " He then extends these same views to the white inhabitants of colder climates . I am indebted to ...
... climate , this would at length become the most prevalent , if not the only race , in the particular country in which it had originated . " He then extends these same views to the white inhabitants of colder climates . I am indebted to ...
Página 2
... climate , food , & c . , as the only possible cause of variation . In one limited sense , as we shall hereafter see , this may be true ; but it is preposterous to attribute to mere external conditions , the structure , for instance , of ...
... climate , food , & c . , as the only possible cause of variation . In one limited sense , as we shall hereafter see , this may be true ; but it is preposterous to attribute to mere external conditions , the structure , for instance , of ...
Página 5
... climates and treat- ment , we are driven to conclude that this great variability is due to our domestic productions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent ...
... climates and treat- ment , we are driven to conclude that this great variability is due to our domestic productions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent ...
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Términos y frases comunes
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