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 74
... structure of the adult ; and probably in the case of those insects which live only for a few hours , and which never feed , a large part of their structure is merely the correlated result of successive changes in the structure of their ...
... structure of the adult ; and probably in the case of those insects which live only for a few hours , and which never feed , a large part of their structure is merely the correlated result of successive changes in the structure of their ...
Page 157
... structure in a fossil condition will always be less , from their having existed in lesser numbers , than in the case of species with fully developed structures . I will now give two or three instances of diversified and of changed ...
... structure in a fossil condition will always be less , from their having existed in lesser numbers , than in the case of species with fully developed structures . I will now give two or three instances of diversified and of changed ...
Page 381
... structure of its progenitor . In two groups of animals , however much they may at present differ from each other in structure and habits , if they pass through the same or similar embryonic stages , we may feel assured that they have ...
... structure of its progenitor . In two groups of animals , however much they may at present differ from each other in structure and habits , if they pass through the same or similar embryonic stages , we may feel assured that they have ...
Contents
VARIATION UNDER DOMESTICATION | 6 |
VARIATION UNDER NATURE | 38 |
STRUGGLE FOR EXISTENCE | 52 |
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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