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 7
... less water at some particular period of growth , will determine whether or not a plant will produce seeds . I cannot here give the details which I have collected and elsewhere published on this curious subject ; but to show how singular ...
... less water at some particular period of growth , will determine whether or not a plant will produce seeds . I cannot here give the details which I have collected and elsewhere published on this curious subject ; but to show how singular ...
Página 8
... less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild ...
... less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild ...
Página 9
... less dogs have imperfect teeth : long - haired and coarse - haired animals are apt to have , as is asserted , long or many horns ; pigeons with feathered feet have skin between their outer toes ; pigeons with short beaks have small feet ...
... less dogs have imperfect teeth : long - haired and coarse - haired animals are apt to have , as is asserted , long or many horns ; pigeons with feathered feet have skin between their outer toes ; pigeons with short beaks have small feet ...
Página 10
... less strange and com- moner deviations may be freely admitted to be inheritable Perhaps the correct way of viewing the whole subject would be , to look at the inheritance of every character whatever as the rule , and non - inheritance ...
... less strange and com- moner deviations may be freely admitted to be inheritable Perhaps the correct way of viewing the whole subject would be , to look at the inheritance of every character whatever as the rule , and non - inheritance ...
Página 12
... less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other species of the same genus , in several trifling ...
... less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other species of the same genus , in several trifling ...
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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