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 29
... families . The same remark holds good in regard to the fruit of the several varieties of the plum , and still more strongly with the melon , as well as in many other analogous cases . To sum up on the origin of our domestic races of ...
... families . The same remark holds good in regard to the fruit of the several varieties of the plum , and still more strongly with the melon , as well as in many other analogous cases . To sum up on the origin of our domestic races of ...
Página 89
... families . Thus it is , as I believe , that two or more genera are produced by descent with modification , from two or more species of the same genus . And the two or more parent - species are supposed to be descended from some one ...
... families . Thus it is , as I believe , that two or more genera are produced by descent with modification , from two or more species of the same genus . And the two or more parent - species are supposed to be descended from some one ...
Página 90
... families , or orders , according to the amount of divergent modification supposed to be represented in the diagram . And the two new families , or orders , are descended from two species of the original genus , and these are supposed to ...
... families , or orders , according to the amount of divergent modification supposed to be represented in the diagram . And the two new families , or orders , are descended from two species of the original genus , and these are supposed to ...
Página 97
... families , families , orders , sub - classes and classes . The several subordinate groups in any class cannot be ranked in a single file , but seem clustered round points , and these round other points , and so on in almost endless ...
... families , families , orders , sub - classes and classes . The several subordinate groups in any class cannot be ranked in a single file , but seem clustered round points , and these round other points , and so on in almost endless ...
Página 98
... families , and genera which have now no living representatives , and which are known to us only in a fossil state . As we here and there see a thin straggling branch springing from a fork low down in a tree , and which by some chance ...
... families , and genera which have now no living representatives , and which are known to us only in a fossil state . As we here and there see a thin straggling branch springing from a fork low down in a tree , and which by some chance ...
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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