On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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16 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 ...
23 페이지
... 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 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 unimporta for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of ...
24 페이지
... tends to appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to ...
... tends to appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to ...
45 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 civilisation 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 civilisation of the inhabitants , -slowly to add to the ...
58 페이지
... tend to obscure this result , that I am surprised that my tables show even a small majority on the side of the larger genera . I will here allude to only two causes of obscurity . Fresh - water and salt - loving plants have have ...
... tend to obscure this result , that I am surprised that my tables show even a small majority on the side of the larger genera . I will here allude to only two causes of obscurity . Fresh - water and salt - loving plants have have ...
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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