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 96
... forms decrease and become rare . Rarity , as geology tells us , is the precursor to extinction . We can , also , see ... forms are continually and slowly being produced , unless we believe that the number of specific forms goes on ...
... forms decrease and become rare . Rarity , as geology tells us , is the precursor to extinction . We can , also , see ... forms are continually and slowly being produced , unless we believe that the number of specific forms goes on ...
Page 276
... forms of life in various parts of Europe , they add , " If struck by this strange sequence , we turn our atten- tion to North America , and there discover a series of analo- gous phenomena , it will appear certain that all these modi ...
... forms of life in various parts of Europe , they add , " If struck by this strange sequence , we turn our atten- tion to North America , and there discover a series of analo- gous phenomena , it will appear certain that all these modi ...
Page 322
... forms have apparently migrated from the north to the south than in a reversed direction . We see , however , a few southern vegetable forms on the mountains of Borneo and Abyssinia . I suspect that this preponderant migration from north ...
... forms have apparently migrated from the north to the south than in a reversed direction . We see , however , a few southern vegetable forms on the mountains of Borneo and Abyssinia . I suspect that this preponderant migration from north ...
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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