On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeMurray, 1860 - 502페이지 |
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66개의 결과 중 1 - 5개
5 페이지
... tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of ...
... tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of ...
12 페이지
... tends to depart in some small degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of ...
... tends to depart in some small degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of ...
13 페이지
... tends to appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly ...
... tends to appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly ...
14 페이지
... tend to appear in 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 embryology . These remarks are of course confined to the first ...
... tend to appear in 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 embryology . These remarks are of course confined to the first ...
40 페이지
... tend , -perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state of civilization of the inhabitants , -slowly to add to the ...
... tend , -perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state of civilization of the inhabitants , -slowly to add to the ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely