The origin of species by means of natural selectionРипол Классик, 1929 - 488페이지 |
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3 페이지
... plant itself. The author of the Vestige: of Creation would, I presume, say that, after a certain unknown number of generations, some bird had ... plants would ofl'er the best chance of making out this obscure roblem. Nor have INTRODUCTION 3.
... plant itself. The author of the Vestige: of Creation would, I presume, say that, after a certain unknown number of generations, some bird had ... plants would ofl'er the best chance of making out this obscure roblem. Nor have INTRODUCTION 3.
7 페이지
... plants and animals, one of the first points which strikes us is, that they enerally diifer more from each other than do the individuals of any one Species or variety in a state of nature. When we reflect on the vast diversity of the plants ...
... plants and animals, one of the first points which strikes us is, that they enerally diifer more from each other than do the individuals of any one Species or variety in a state of nature. When we reflect on the vast diversity of the plants ...
8 페이지
... plants, such as wheat, still often yield new varieties: our oldest domesticated animals are still capable of rapid im rovement or modification. It has been dis uted at what period of life the causes of variability, w atever the may be ...
... plants, such as wheat, still often yield new varieties: our oldest domesticated animals are still capable of rapid im rovement or modification. It has been dis uted at what period of life the causes of variability, w atever the may be ...
9 페이지
... plants ave pollen utterly worthless, in the same exact condition as in the most sterile hybrids. When, on the one hand, we see domesticated animals and plants, though often weak and sickly, yet breeding quite freely under confinement ...
... plants ave pollen utterly worthless, in the same exact condition as in the most sterile hybrids. When, on the one hand, we see domesticated animals and plants, though often weak and sickly, yet breeding quite freely under confinement ...
10 페이지
... plants. Under this oint of view, Mr. Buckman's recent experiments on p ants are extremely valuable. When all or nearly all the individuals exposed to certain conditions are affected in the same way, the change at first appears to be ...
... plants. Under this oint of view, Mr. Buckman's recent experiments on p ants are extremely valuable. When all or nearly all the individuals exposed to certain conditions are affected in the same way, the change at first appears to be ...
목차
5 | |
ON was GEOLOGICAL SUCCESSION OF ORGANIC | 155 |
GEOGRAPHICAL DISTRIBUTION | 282 |
Gnoonnmcu DISTRIBUTION Continued | 302 |
RECAPITULATION AND CONCLUSION | 415 |
41 | 449 |
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action adapted advantage allied America amount ancient animals appear become believe birds breeds cause characters climate closely common considered continuous crossed descendants difl'erent distinct domestic doubt evidence existing extinct extremely facts families favourable fertility find first flowers follow formations forms genera genus give given greater groups habits hand Hence hybrids important increase individuals inhabitants inherited insects instance instincts intermediate islands kind known land laws less lines living look males manner means migration modification namely natural selection naturalists nearly never observed occur organic origin parent perfect period plants points present principle probably produced range ranked reason regions remains remarked resemble seeds seems seen separated shown single slight sometimes species sterility structure struggle successive suppose tend theory tion trees variability variations varieties vary whole widely