On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for Life |
From inside the book
Results 1-3 of 63
Page 270
... single species or any single genus endures . There is reason to believe that the complete extinction of the species of a group is generally a slower process than their production : if the appearance and disappearance of a group of ...
... single species or any single genus endures . There is reason to believe that the complete extinction of the species of a group is generally a slower process than their production : if the appearance and disappearance of a group of ...
Page 302
... single and multiple centres of creation " do not directly bear on another allied question -namely whether all the individuals of the same species have descended from a single pair , or single hermaphrodite , or whether , as some authors ...
... single and multiple centres of creation " do not directly bear on another allied question -namely whether all the individuals of the same species have descended from a single pair , or single hermaphrodite , or whether , as some authors ...
Page 360
... single species , and gives a single definition . As soon as three Orchidean forms ( Monochanthus , Myan- thus , and Catasetum ) , which had previously been ranked as three distinct genera , were known to be sometimes pro- duced on the ...
... single species , and gives a single definition . As soon as three Orchidean forms ( Monochanthus , Myan- thus , and Catasetum ) , which had previously been ranked as three distinct genera , were known to be sometimes pro- duced on the ...
Contents
VARIATION UNDER DOMESTICATION | 6 |
VARIATION UNDER NATURE | 38 |
STRUGGLE FOR EXISTENCE | 52 |
Copyright | |
14 other sections not shown
Other editions - View all
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