The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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vi 페이지
... widely different from those of their allies Organs of extreme perfection Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect The law of Unity of ...
... widely different from those of their allies Organs of extreme perfection Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect The law of Unity of ...
vii 페이지
... Widely different organs in members of the same class , developed from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications .. Page 168-204 - CHAPTER VIII . INSTINCT . Instincts comparable with habits ...
... Widely different organs in members of the same class , developed from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications .. Page 168-204 - CHAPTER VIII . INSTINCT . Instincts comparable with habits ...
4 페이지
... 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 ...
29 페이지
... widely , and will be recognised 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 recognised 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 ...
34 페이지
... 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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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 formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species 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 theory tion variability variations varieties vary whilst whole wings young