The origin of species by means of natural selectionРипол Классик, 1929 - 454 páginas |
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Página 14
... shall be preserved. When we look to the hereditary varieties or races of our domestic animals and plants, and compare them with closely-allied species, we generally rceive in each domestic race, 14 ON THE ORIGIN OF SPECIES.
... shall be preserved. When we look to the hereditary varieties or races of our domestic animals and plants, and compare them with closely-allied species, we generally rceive in each domestic race, 14 ON THE ORIGIN OF SPECIES.
Página 15
... allied. With these exceptions (and wit that of the rfect fertility of varieties when crossed ,-—-a subject ereafier to be discussed), domestic races of the same species difl'er from each other in the same manner as, only in most cases ...
... allied. With these exceptions (and wit that of the rfect fertility of varieties when crossed ,-—-a subject ereafier to be discussed), domestic races of the same species difl'er from each other in the same manner as, only in most cases ...
Página 16
... allied natural species—for instance, of the many foxes—inhabiting difl'erent quarters of the world. I do not believe, as we shall presently see, that the whole amount of difference between' the several breeds of the dog has been ...
... allied natural species—for instance, of the many foxes—inhabiting difl'erent quarters of the world. I do not believe, as we shall presently see, that the whole amount of difference between' the several breeds of the dog has been ...
Página 20
... allied to the carrier, but, instead of a very long beak, has a very short and very broad one. The pouter has a much- elongated body, wings, and legs; and its enormously developed crop, which it lories in inflating, may well excite ...
... allied to the carrier, but, instead of a very long beak, has a very short and very broad one. The pouter has a much- elongated body, wings, and legs; and its enormously developed crop, which it lories in inflating, may well excite ...
Página 29
... allied subreeds. And when a cross has been made, the closest selection is far more indispensable even than in ordinary cases. If selection consisted merely in separating some very distinct variety, and breeding from it, the principle ...
... allied subreeds. And when a cross has been made, the closest selection is far more indispensable even than in ordinary cases. If selection consisted merely in separating some very distinct variety, and breeding from it, the principle ...
Contenido
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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Términos y frases comunes
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