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
... Individual differences — Doubtful species — Wide ranging , much diffused , and common species , vary most - Species of ... individuals and varieties of the same species : often severe between species of the same genus - The relation of ...
... Individual differences — Doubtful species — Wide ranging , much diffused , and common species , vary most - Species of ... individuals and varieties of the same species : often severe between species of the same genus - The relation of ...
Página vi
... individuals cf the same species - Circumstances favourable and unfa- vourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection ...
... individuals cf the same species - Circumstances favourable and unfa- vourable to the results of Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action - Extinction caused by Natural Selection ...
Página 3
... individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring struggle for existence , it follows that any being , if it vary however slightly in any manner profitable to itself ...
... individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring struggle for existence , it follows that any being , if it vary however slightly in any manner profitable to itself ...
Página 5
... individuals of the same variety or sub- variety of our older cultivated plants and animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or ...
... individuals of the same variety or sub- variety of our older cultivated plants and animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or ...
Página 6
... individuals exposed to certain conditions during several generations are 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 ...
... individuals exposed to certain conditions during several generations are 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 ...
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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