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 xxi
... whole series of changes which they have suffered . " 6 In December , 1859 , Dr. Hooker published his Introduction to the Australian Flora . ' In the first part of this great work he admits the truth of the descent and modification of ...
... whole series of changes which they have suffered . " 6 In December , 1859 , Dr. Hooker published his Introduction to the Australian Flora . ' In the first part of this great work he admits the truth of the descent and modification of ...
Página 3
... whole animal and vegetable kingdoms . As many more 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 ...
... whole animal and vegetable kingdoms . As many more 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 ...
Página 5
... , -directly on the whole organisation or on certain parts alone , and indirectly by affecting the reproductive system . With respect to the direct action , we must bear in mind that in every CHAP . 1 . Variation under Domestication .
... , -directly on the whole organisation or on certain parts alone , and indirectly by affecting the reproductive system . With respect to the direct action , we must bear in mind that in every CHAP . 1 . Variation under Domestication .
Página 9
... whole organisation seems to have become plastic , and departs in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of ...
... whole organisation seems to have become plastic , and departs in a slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of ...
Página 10
... whole subject would be , to look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same peculiarity ...
... whole subject would be , to look at the inheritance of every character whatever as the rule , and non - inheritance as the anomaly . The laws governing inheritance are for the most part unknown . No one can say why the same peculiarity ...
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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