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 232
... crossed . Hybrids and Mongrels compared , independently of their fertility . - Independently of the question of fertility , the offspring of species when crossed and of varieties when crossed may be compared in several other respects ...
... crossed . Hybrids and Mongrels compared , independently of their fertility . - Independently of the question of fertility , the offspring of species when crossed and of varieties when crossed may be compared in several other respects ...
Page 419
... crossed varieties , 229 Fir - trees destroyed by cattle , 62 pollen of , 174 Fish , flying , 156 teleostean , sudden appearance of , 259 eating seeds , 307 , 328 fresh - water , distribution of , 325 Fishes , now confined to fresh water ...
... crossed varieties , 229 Fir - trees destroyed by cattle , 62 pollen of , 174 Fish , flying , 156 teleostean , sudden appearance of , 259 eating seeds , 307 , 328 fresh - water , distribution of , 325 Fishes , now confined to fresh water ...
Page 426
... crossed , fertile , 229 when crossed , sterile , 230 classification of , 359 Verbascum , sterility of , 215 varieties of , crossed , 231 Verneuil , M. de , on the succession of species , 276 Viola , tricolor , 63 Volcanic islands ...
... crossed , fertile , 229 when crossed , sterile , 230 classification of , 359 Verbascum , sterility of , 215 varieties of , crossed , 231 Verneuil , M. de , on the succession of species , 276 Viola , tricolor , 63 Volcanic islands ...
Contents
INTRODUCTION | 1 |
STRUGGLE FOR EXISTENCE | 52 |
NATURAL SELECTION | 69 |
Copyright | |
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Common terms and phrases
accumulated adapted affinities allied species amount analogous ancient 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 doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formation 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 occasional oceanic islands offspring Origin of Species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory tion trees variability variation vary whole widely