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 250
... migration during climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well known , for instance , that several species ...
... migration during climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well known , for instance , that several species ...
Page 298
... migrate in a body into a new and afterwards isolated country , they will bettle liable to modification ; for neither migration nor isolation themselves can do anything . These principles come into play only by bringing organisms into ...
... migrate in a body into a new and afterwards isolated country , they will bettle liable to modification ; for neither migration nor isolation themselves can do anything . These principles come into play only by bringing organisms into ...
Page 312
... migration as the cold came on , and the re - migration on the returning warmth , will generally have been due south and north . The Alpine plants , for example , of Scotland , as remarked by Mr. H. C. Watson , and those of the Pyrenees ...
... migration as the cold came on , and the re - migration on the returning warmth , will generally have been due south and north . The Alpine plants , for example , of Scotland , as remarked by Mr. H. C. Watson , and those of the Pyrenees ...
Contents
VARIATION UNDER DOMESTICATION | 6 |
VARIATION UNDER NATURE | 38 |
STRUGGLE FOR EXISTENCE | 52 |
Copyright | |
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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