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Youatt gives an excellent illustration of the effects of a course of selection, which may be considered as unconsciously followed, in so far that the breeders could never have expected or even have wished to have produced the result which ensued namely, the production of two distinct strains. The two flocks of Leicester sheep kept by Mr Buckley and Mr Burgess, as Mr Youatt remarks, 'have been purely bred from the original stock of Mr Bakewell for upwards of fifty years. There is not a suspicion existing in the mind of any one at all acquainted with the subject that the owner of either of them has deviated in any one instance from the pure blood of Mr Bakewell's flock, and yet the difference between the sheep possessed by these two gentlemen is so great that they have the appearance of being quite different varieties.'
The mender of roads went home, with the dust going on before him according to the set of the wind, and was soon at the fountain, squeezing himself in among the lean kine brought there to drink, and appearing even to whisper to them in his whispering to all the village. When the village had taken its poor supper, it did not creep to bed, as it usually did, but came out of doors again, and remained there. A curious contagion of whispering was upon it, and also, when it gathered together at the fountain in the dark, another curious contagion of looking expectantly at the sky in one direction only. Monsieur Gabelle, chief functionary of the place, became uneasy; went out on his house-top alone, and looked in that direction too; glanced down from behind his chimneys at the darkening faces by the fountain below, and sent word to the sacristan who kept the keys of the church, that there might be need to ring the tocsin by-and-by.
"My daughter," said Rustico, "it will not always be so." And to makesure of it, before either of them moved from the bed they put him insix times, after which the Devil hung his head and was glad to letthem be.
'Aire? Bah! I cannot say it. Well, our ship stopped in the morning,before it was quite daylight, at a great city- a huge city, withvery dark houses and all smoky; not at all like the pretty cleantown I came from; and Mr. Rochester carried me in his arms over aplank to the land, and Sophie came after, and we all got into a coach,which took us to a beautiful large house, larger than this andfiner, called an hotel. We stayed there nearly a week: I and Sophieused to walk every day in a great green place full of trees, calledthe Park; and there were many children there besides me, and a pondwith beautiful birds in it, that I fed with crumbs.'[回复]
The only difference between organisms which annually produce eggs or seeds by the thousand, and those which produce extremely few, is, that the slow-breeders would require a few more years to people, under favourable conditions, a whole district, let it be ever so large. The condor lays a couple of eggs and the ostrich a score, and yet in the same country the condor may be the more numerous of the two: the Fulmar petrel lays but one egg, yet it is believed to be the most numerous bird in the world. One fly deposits hundreds of eggs, and another, like the hippobosca, a single one; but this difference does not determine how many individuals of the two species can be supported in a district. A large number of eggs is of some importance to those species, which depend on a rapidly fluctuating amount of food, for it allows them rapidly to increase in number. But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life; and this period in the great majority of cases is an early one. If an animal can in any way protect its own eggs or young, a small number may be produced, and yet the average stock be fully kept up; but if many eggs or young are destroyed, many must be produced, or the species will become extinct. It would suffice to keep up the full number of a tree, which lived on an average for a thousand years, if a single seed were produced once in a thousand years, supposing that this seed were never destroyed, and could be ensured to germinate in a fitting place. So that in all cases, the average number of any animal or plant depends only indirectly on the number of its eggs or seeds.In looking at Nature, it is most necessary to keep the foregoing considerations always in mind never to forget that every single organic being around us may be said to be striving to the utmost to increase in numbers; that each lives by a struggle at some period of its life; that heavy destruction inevitably falls either on the young or old, during each generation or at recurrent intervals. Lighten any check, mitigate the destruction ever so little, and the number of the species will almost instantaneously increase to any amount. The face of Nature may be compared to a yielding surface, with ten thousand sharp wedges packed close together and driven inwards by incessant blows, sometimes one wedge being struck, and then another with greater force.[回复]
The officials began to laugh when they heard the Sultan's command, but as soon as they could speak they said, "Deign, your highness, to excuse our mirth, but those lines were not written by a man but by a monkey."如果吃不了苦 千万别独去尼泊尔
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