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 xvi
... side of change . The Vestiges of Creation ' appeared in 1844. In the tenth and much improved edition ( 1853 ) the anonymous author says ( p . 155 ) : - The proposition determined on after much considera- tion is , that the several ...
... side of change . The Vestiges of Creation ' appeared in 1844. In the tenth and much improved edition ( 1853 ) the anonymous author says ( p . 155 ) : - The proposition determined on after much considera- tion is , that the several ...
Página 2
... sides of each question ; and this is here impossible . I much regret that want of space prevents my having the satis- faction of acknowledging the generous assistance which I have received from very many naturalists , some of them ...
... sides of each question ; and this is here impossible . I much regret that want of space prevents my having the satis- faction of acknowledging the generous assistance which I have received from very many naturalists , some of them ...
Página 44
... side , and all those in the smaller genera on the other side , the former will be found to include a somewhat larger number of the very common and much diffused or dominant species . This might have been antici- pated ; for the mere ...
... side , and all those in the smaller genera on the other side , the former will be found to include a somewhat larger number of the very common and much diffused or dominant species . This might have been antici- pated ; for the mere ...
Página 45
... side of the larger genera presented varieties , than on the side of the smaller genera . Moreover , the species of the large genera which present any varieties , invariably present a larger average number of varieties than do the ...
... side of the larger genera presented varieties , than on the side of the smaller genera . Moreover , the species of the large genera which present any varieties , invariably present a larger average number of varieties than do the ...
Página 104
... sides , and to overtop and kill the surrounding twigs and branches , in the same manner as species and groups of species have at all times overmastered other species in the great battle for life . The limbs divided into great branches ...
... sides , and to overtop and kill the surrounding twigs and branches , in the same manner as species and groups of species have at all times overmastered other species in the great battle for life . The limbs divided into great branches ...
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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