On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeHurst, 1872 - Всего страниц: 447 |
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On the Origin of the Species by Means of Natural Selection: Or, The ... Charles Darwin Полный просмотр - 1869 |
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accumulated adapted affinities allied America ancient animals appear archipelago Asa Gray become bees believe birds breeds cause cells characters climate closely closely-allied color common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt eggs embryo existing exterminated extinct extremely facts favorable females fertility flowers formations forms fossil Fritz Müller Gärtner genera genus geological geological periods Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organic paleozoic parent parent-species perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive supposed theory tion variability variations vary whole widely