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 239
... intermediate forms must , on my theory , have formerly existed . I have found it difficult , when looking at any two species , to avoid picturing to myself , forms directly intermediate between them . But this is a wholly false view ...
... intermediate forms must , on my theory , have formerly existed . I have found it difficult , when looking at any two species , to avoid picturing to myself , forms directly intermediate between them . But this is a wholly false view ...
Page 284
... intermediate , as unequal in- tervals of time have elapsed between consecutive formations . It is no real objection ... intermediate in character , intermediate in age . But supposing for an instant , in this and other such cases , that ...
... intermediate , as unequal in- tervals of time have elapsed between consecutive formations . It is no real objection ... intermediate in character , intermediate in age . But supposing for an instant , in this and other such cases , that ...
Page 392
... intermediate varieties in the intermediate zone . For we have reason to believe that only a few species are under- going change at any one period ; and all changes are slowly effected . I have also shown that the intermediate varieties ...
... intermediate varieties in the intermediate zone . For we have reason to believe that only a few species are under- going change at any one period ; and all changes are slowly effected . I have also shown that the intermediate varieties ...
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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