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 12
... offspring at the same period at which it first appeared in the parent . I believe this rule to be of the highest importance in explaining the laws of embryo- logy . These remarks are of course confined to the first appearance of the ...
... offspring at the same period at which it first appeared in the parent . I believe this rule to be of the highest importance in explaining the laws of embryo- logy . These remarks are of course confined to the first appearance of the ...
Page 211
... offspring , is , on my theory , of equal importance with the sterility of species ; for it seems to make a broad and clear distinction between varieties and species . First , for the sterility of species when crossed and of their hybrid ...
... offspring , is , on my theory , of equal importance with the sterility of species ; for it seems to make a broad and clear distinction between varieties and species . First , for the sterility of species when crossed and of their hybrid ...
Page 232
... offspring of species and the so - called mongrel offspring of varieties . And , on the other hand , they agree most closely in very many important respects . I shall here discuss this subject with extreme brevity . The most important ...
... offspring of species and the so - called mongrel offspring of varieties . And , on the other hand , they agree most closely in very many important respects . I shall here discuss this subject with extreme brevity . The most important ...
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