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 41
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
Page 42
... ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called ... ranked as distinct species by many entomologists . Even Ireland has a few animals , now generally regarded as varie ...
... ranked by one eminent naturalist as undoubted species , and by another as varieties , or , as they are often called ... ranked as distinct species by many entomologists . Even Ireland has a few animals , now generally regarded as varie ...
Page 50
... ranked as species , but which he considers as so closely allied to other species as to be of doubtful value : these 63 reputed species range on an average over 69 of the provinces into which Mr. Watson has divided Great Britain . Now ...
... ranked as species , but which he considers as so closely allied to other species as to be of doubtful value : these 63 reputed species range on an average over 69 of the provinces into which Mr. Watson has divided Great Britain . Now ...
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