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 vi
... Diversified habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of small. vi CONTENTS .
... Diversified habits in the same species - Species with habits widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of small. vi CONTENTS .
Página vii
... Widely different organs in members of the same class , developed from one and the same source - Reasons for disbelieving in great and abrupt modifications 156 .. CHAPTER VIII . INSTINCT . Instincts comparable with habits , but different ...
... Widely different organs in members of the same class , developed from one and the same source - Reasons for disbelieving in great and abrupt modifications 156 .. CHAPTER VIII . INSTINCT . Instincts comparable with habits , but different ...
Página 4
... widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and ...
... widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and ...
Página 27
... widely , and will be recognized as something distinct and valuable , and will then probably first receive a provincial name . In semi - civilised countries , with little free communication , the spreading of a new sub - breed would be a ...
... widely , and will be recognized as something distinct and valuable , and will then probably first receive a provincial name . In semi - civilised countries , with little free communication , the spreading of a new sub - breed would be a ...
Página 31
... widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been argued that this had appeared as a ...
... widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been argued that this had appeared as a ...
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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