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 viii
... of the level of the land , and by occasional means - Dispersal during the Glacial period co - extensive with the world 376-413 .. .. CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of viii CONTENTS .
... of the level of the land , and by occasional means - Dispersal during the Glacial period co - extensive with the world 376-413 .. .. CHAPTER XII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of viii CONTENTS .
Page xviii
... lands , ' & c . ) , in which he maintains the progressive development of organic forms on the earth . He infers that many species have kept true for long periods , whereas a few have become modified . The distinction of species he ...
... lands , ' & c . ) , in which he maintains the progressive development of organic forms on the earth . He infers that many species have kept true for long periods , whereas a few have become modified . The distinction of species he ...
Page 31
... land or mountain pasture , with the wool of one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in very different ways ; when we compare the game ...
... land or mountain pasture , with the wool of one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in very different ways ; when we compare the game ...
Page 43
... land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be ...
... land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be ...
Page 50
... land , I was much struck how entirely vague and arbi- trary is the distinction between species and varieties . On the islets of the little Madeira group there are many insects which are characterized as varieties in Mr. Wollaston's ...
... land , I was much struck how entirely vague and arbi- trary is the distinction between species and varieties . On the islets of the little Madeira group there are many insects which are characterized as varieties in Mr. Wollaston's ...
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Common terms and phrases
accumulated adapted affinities allied species America amount analogous ancient animals appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ laws less living male mammals manner Marsupials migration modification modified descendants mongrels natural selection naturalists nearly nest occasionally offspring organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor racter ranked reciprocal crosses remarked resemble rudimentary organs seeds Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely