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 vi
... 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 ...
Página vii
... 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 , but ...
... 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 , but ...
Página 29
... 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 ...
Página 41
... widely extended , he will in the end generally be able to make up his own mind ; but he will succeed in this at the expense of admitting much variation , —and the truth of this admission will often be disputed by other naturalists ...
... widely extended , he will in the end generally be able to make up his own mind ; but he will succeed in this at the expense of admitting much variation , —and the truth of this admission will often be disputed by other naturalists ...
Página 43
... widely diffused within their own country ( and this is a different consideration from wide range , and to a certain extent from com- monness ) , oftenest give rise to varieties sufficiently well - marked to have been recorded in ...
... widely diffused within their own country ( and this is a different consideration from wide range , and to a certain extent from com- monness ) , oftenest give rise to varieties sufficiently well - marked to have been recorded 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