The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 162
... 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 ...
Página 163
... sides many a feebler branch , so by generation I believe it has been with the great Tree of Life , which fills with its dead and broken branches the crust of the earth , and covers the surface with its ever- branching and beautiful ...
... sides many a feebler branch , so by generation I believe it has been with the great Tree of Life , which fills with its dead and broken branches the crust of the earth , and covers the surface with its ever- branching and beautiful ...
Página 178
... sides of the body varying in the same manner ; in the front and hind legs , and even in the jaws and limbs , varying ... side ; and if this had been of any great use to the breed , it might probably have been ren- dered permanent by ...
... sides of the body varying in the same manner ; in the front and hind legs , and even in the jaws and limbs , varying ... side ; and if this had been of any great use to the breed , it might probably have been ren- dered permanent by ...
Página 182
... side , nature is forced to economise on the other side . " I think this holds true to a certain extent with our domestic productions : if nourishment flows to one part or organ in excess , it rarely flows , at least in excess , to ...
... side , nature is forced to economise on the other side . " I think this holds true to a certain extent with our domestic productions : if nourishment flows to one part or organ in excess , it rarely flows , at least in excess , to ...
Página 200
... side of the face , moreover , is sometimes striped . The stripes are often plainest in the foal ; and some- times quite disappear in old horses . Colonel Poole has seen both gray and bay Kattywar horses striped when first foaled . I ...
... side of the face , moreover , is sometimes striped . The stripes are often plainest in the foal ; and some- times quite disappear in old horses . Colonel Poole has seen both gray and bay Kattywar horses striped when first foaled . I ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young