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 viii
... single species - On Extinction - On simultaneous changes in the forms of life throughout the world On the affinities of extinct species to each other and to living species- On the state of develop- ment of ancient forms - On the ...
... single species - On Extinction - On simultaneous changes in the forms of life throughout the world On the affinities of extinct species to each other and to living species- On the state of develop- ment of ancient forms - On the ...
Página xv
... Single Vision ' appeared in 1818. In this paper he distinctly recognises the principle of natural selection , and this is the first recognition which has been indicated ; but he applies it only to the races of man , and to certain ...
... Single Vision ' appeared in 1818. In this paper he distinctly recognises the principle of natural selection , and this is the first recognition which has been indicated ; but he applies it only to the races of man , and to certain ...
Página xxi
... single parent - form . In June , 1859 , Professor Huxley gave a lecture before the Royal Institution on the Persistent Types of Animal life . ' Referring to such cases , he remarks , " It is difficult to comprehend the meaning of such ...
... single parent - form . In June , 1859 , Professor Huxley gave a lecture before the Royal Institution on the Persistent Types of Animal life . ' Referring to such cases , he remarks , " It is difficult to comprehend the meaning of such ...
Página 8
... single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may be named , can be pro- pagated by grafts , offsets , & c . , and sometimes by seed . They ...
... single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may be named , can be pro- pagated by grafts , offsets , & c . , and sometimes by seed . They ...
Página 11
... single variety should have been turned loose in its new home . Neverthe- less , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , it seems to me not improbable that if we could succeed in ...
... single variety should have been turned loose in its new home . Neverthe- less , as our varieties certainly do occasionally revert in some of their characters to ancestral forms , it seems to me not improbable that if we could succeed in ...
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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