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 138
... crossing on the laws of inheritance . No doubt it is a very surprising fact that characters should reappear after having been lost for many , perhaps for hundreds of generations . But when a breed has been crossed only once by some ...
... crossing on the laws of inheritance . No doubt it is a very surprising fact that characters should reappear after having been lost for many , perhaps for hundreds of generations . But when a breed has been crossed only once by some ...
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 ...
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