The origin of species by means of natural selectionРипол Классик, 1929 - 454페이지 |
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35 페이지
... region inhabited by quite uncivilised man, has afl'orded us a single plant worth culture. It is not that these countries, so rich in species, do not by a strange chance possess the aboriginal stocks of any useful plants, but that the ...
... region inhabited by quite uncivilised man, has afl'orded us a single plant worth culture. It is not that these countries, so rich in species, do not by a strange chance possess the aboriginal stocks of any useful plants, but that the ...
48 페이지
... regions; but I have not much faith in this view ; and I attribute the assage of a variety, from a state in which it differs very slightly from its parent to one in which it diifers more, to the action of natural selection in ...
... regions; but I have not much faith in this view ; and I attribute the assage of a variety, from a state in which it differs very slightly from its parent to one in which it diifers more, to the action of natural selection in ...
64 페이지
... region to a dry, we i11variably see some species gradually getting rarer and rarer, and finally disappearing; and the ... regions, or snow-capped summits, or absolute deserts, the struggle for life is almost exclusively with the elements ...
... region to a dry, we i11variably see some species gradually getting rarer and rarer, and finally disappearing; and the ... regions, or snow-capped summits, or absolute deserts, the struggle for life is almost exclusively with the elements ...
72 페이지
... regions or on the borders of an utter desert, will competition cease. The land ma be extremely cold or dry, yet there will be competition between some few s ecies, or between the individuals of the same species, or the warmest or ...
... regions or on the borders of an utter desert, will competition cease. The land ma be extremely cold or dry, yet there will be competition between some few s ecies, or between the individuals of the same species, or the warmest or ...
98 페이지
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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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자주 나오는 단어 및 구문
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