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 21
... probably have varied in the same manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture , light , food , & c . , is most difficult ; my impression is , that with animals ...
... probably have varied in the same manner . To judge how much , in the case of any variation , we should attribute to the direct action of heat , moisture , light , food , & c . , is most difficult ; my impression is , that with animals ...
Page 26
... probably do occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved . ] When we look to the hereditary varieties or races of our domestic animals and ...
... probably do occur ; but natural selection , as will hereafter be explained , will determine how far the new characters thus arising shall be preserved . ] When we look to the hereditary varieties or races of our domestic animals and ...
Page 28
... probably for ever remain vague . But I may here state , that looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have ...
... probably for ever remain vague . But I may here state , that looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild species of Canidæ have ...
Page 37
... probably arisen suddenly , or by one step ; many botanists , for instance , believe that the fuller's teazle , with its hooks , which cannot be rivalled by any mechanical contrivance , is only a variety of the wild Dipsacus ; and this ...
... probably arisen suddenly , or by one step ; many botanists , for instance , believe that the fuller's teazle , with its hooks , which cannot be rivalled by any mechanical contrivance , is only a variety of the wild Dipsacus ; and this ...
Page 38
... probably better acquainted with the works of agriculturists than almost any other individual , and who was himself a very good judge of an animal , speaks of the principle of selection as that which enables the agriculturist not only to ...
... probably better acquainted with the works of agriculturists than almost any other individual , and who was himself a very good judge of an animal , speaks of the principle of selection as that which enables the agriculturist not only to ...
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Common terms and phrases
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely