On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCassell, 1909 - 430페이지 |
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8 페이지
... organisation - Low forms preserved - Objections considered - Indefinite multiplication of species - Summary .. 78 ... organised structures variable - Parts developed in an unusual manner are highly variable : specific characters more ...
... organisation - Low forms preserved - Objections considered - Indefinite multiplication of species - Summary .. 78 ... organised structures variable - Parts developed in an unusual manner are highly variable : specific characters more ...
19 페이지
... organisation has once begun to vary , it generally continues to vary for many generations . No case is on record of a variable being ceasing to be variable under cultivation . Our oldeşt cultivated plants , such as wheat , still often ...
... organisation has once begun to vary , it generally continues to vary for many generations . No case is on record of a variable being ceasing to be variable under cultivation . Our oldeşt cultivated plants , such as wheat , still often ...
20 페이지
... organisation , to the action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male ...
... organisation , to the action of any change in the conditions of life . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confinement , even in the many cases when the male ...
23 페이지
... organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable deviations of ...
... organisation seems to have become plastic , and tends to depart in some small degree from that of the parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable deviations of ...
38 페이지
... organisation as thing quite plastic , which they can model almost as they please . If I had space I could quote numerous passages to this effect from highly competent authorities . Youatt , who was probably better acquainted with the ...
... organisation as thing quite plastic , which they can model almost as they please . If I had space I could quote numerous passages to this effect from highly competent authorities . Youatt , who was probably better acquainted with the ...
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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