On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for Life |
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Page 120
... animals , having ordinary powers of vision , slowly migrated by successive generations from the outer world into the deeper and deeper recesses of the Kentucky caves , as did European animals into the caves of Europe . We have some ...
... animals , having ordinary powers of vision , slowly migrated by successive generations from the outer world into the deeper and deeper recesses of the Kentucky caves , as did European animals into the caves of Europe . We have some ...
Page 122
... animals , several authentic cases could be given of species within historical times having largely extended their range from warmer to cooler latitudes , and conversely ; but we do not positively know that these animals were strictly ...
... animals , several authentic cases could be given of species within historical times having largely extended their range from warmer to cooler latitudes , and conversely ; but we do not positively know that these animals were strictly ...
Page 216
... animals , much fewer experiments have been carefully tried than with plants . If our systematic arrangements can be trusted , that is if the genera of animals are as distinct from each other , as are the genera of plants , then we may ...
... animals , much fewer experiments have been carefully tried than with plants . If our systematic arrangements can be trusted , that is if the genera of animals are as distinct from each other , as are the genera of plants , then we may ...
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distant distinct species divergence domestic doubt eggs embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flower formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder theory tion trees variability variations vary whole widely