The origin of species by means of natural selectionРипол Классик, 1929 - 454페이지 |
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9 페이지
... formation; so that, in fact, ' sports' support in view, that variability ma be largely attributed to e ovules or pollen, or to th, having been afl'ected by the treatment of the parent prior to the VARIATION UNDER DOMESTICATION 9.
... formation; so that, in fact, ' sports' support in view, that variability ma be largely attributed to e ovules or pollen, or to th, having been afl'ected by the treatment of the parent prior to the VARIATION UNDER DOMESTICATION 9.
38 페이지
... formation of new races,—at least, in a country which is already stocked with other races. In this respect enclosure of the land plays a part. Wandering savages or the inhabitants of open plains rarely possess more than one breed of the ...
... formation of new races,—at least, in a country which is already stocked with other races. In this respect enclosure of the land plays a part. Wandering savages or the inhabitants of open plains rarely possess more than one breed of the ...
39 페이지
Charles Darwin. must have largel favoured the improvement and formation of new reeds. Pigeons, I may add, can be propagated in great numbers and at a very nick rate, and inferior birds maybe freely rejected, asw en killed they serve for ...
Charles Darwin. must have largel favoured the improvement and formation of new reeds. Pigeons, I may add, can be propagated in great numbers and at a very nick rate, and inferior birds maybe freely rejected, asw en killed they serve for ...
40 페이지
... formation of new sub-breeds; but the importance of the crossin of varieties has, I believe, been greatly exaggerated, h in regard to animals and to those plants which are propagated by seed. In plants which are temporarily propagated by ...
... formation of new sub-breeds; but the importance of the crossin of varieties has, I believe, been greatly exaggerated, h in regard to animals and to those plants which are propagated by seed. In plants which are temporarily propagated by ...
100 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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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