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 v
... Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed , their Effects ...
... Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed , their Effects ...
Página vi
... DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties - Transitions in habits of life ... difficulty - Natura non facit saltum - Organs of small. vi CONTENTS .
... DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of transitional varieties - Transitions in habits of life ... difficulty - Natura non facit saltum - Organs of small. vi CONTENTS .
Página vii
Or the Preservation of Favoured Races in the Struggle for Life Charles Darwin. difficulty - Natura non facit saltum ... Difficulties of the theory of the Natural Selection of instincts - Neuter or sterile insects - Summary .. 191 CHAPTER ...
Or the Preservation of Favoured Races in the Struggle for Life Charles Darwin. difficulty - Natura non facit saltum ... Difficulties of the theory of the Natural Selection of instincts - Neuter or sterile insects - Summary .. 191 CHAPTER ...
Página xvi
... few in number , and generally marked by intervals of organic character , which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending ,. xvi HISTORICAL SKETCH ...
... few in number , and generally marked by intervals of organic character , which we find to be a practical difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending ,. xvi HISTORICAL SKETCH ...
Página xix
... difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also ...
... difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also ...
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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