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`What can't go on?'
What checks the natural tendency of each species to increase in number is most obscure. Look at the most vigorous species; by as much as it swarms in numbers, by so much will its tendency to increase be still further increased. We know not exactly what the checks are in even one single instance. Nor will this surprise any one who reflects how ignorant we are on this head, even in regard to mankind, so incomparably better known than any other animal. This subject has been ably treated by several authors, and I shall, in my future work, discuss some of the checks at considerable length, more especially in regard to the feral animals of South America. Here I will make only a few remarks, just to recall to the reader's mind some of the chief points. Eggs or very young animals seem generally to suffer most, but this is not invariably the case. With plants there is a vast destruction of seeds, but, from some observations which I have made, I believe that it is the seedlings which suffer most from germinating in ground already thickly stocked with other plants. Seedlings, also, are destroyed in vast numbers by various enemies; for instance, on a piece of ground three feet long and two wide, dug and cleared, and where there could be no choking from other plants, I marked all the seedlings of our native weeds as they came up, and out of the 357 no less than 295 were destroyed, chiefly by slugs and insects. If turf which has long been mown, and the case would be the same with turf closely browsed by quadrupeds, be let to grow, the more vigorous plants gradually kill the less vigorous, though fully grown, plants: thus out of twenty species growing on a little plot of turf (three feet by four) nine species perished from the other species being allowed to grow up freely.The amount of food for each species of course gives the extreme limit to which each can increase; but very frequently it is not the obtaining food, but the serving as prey to other animals, which determines the average numbers of a species. Thus, there seems to be little doubt that the stock of partridges, grouse, and hares on any large estate depends chiefly on the destruction of vermin. If not one head of game were shot during the next twenty years in England, and, at the same time, if no vermin were destroyed, there would, in all probability, be less game than at present, although hundreds of thousands of game animals are now annually killed. On the other hand, in some cases, as with the elephant and rhinoceros, none are destroyed by beasts of prey: even the tiger in India most rarely dares to attack a young elephant protected by its dam.
This sleep, provincial as it was, brought him to nine o'clock inthe morning; at which hour he rose, in order to repair to theresidence of M. de Treville, the third personage in the kingdompaternal estimation.
还 "Well, I will immediately call on M. Danglars, and tell himthat my mother and myself must leave Paris to-morrow. I havenot seen you, consequently I know nothing of your dinner."
"Well, well," said Rochefort, "here is a chance which may pair off withthe other! Monsieur Cardinal is indeed a privileged man!""Imagine my astonishment," continued Milady, "when I found myself faceto face with this woman!"
2、 When Carrie renewed her search, as she did the next day, going tothe Casino, she found that in the opera chorus, as in otherfields, employment is difficult to secure. Girls who can standin a line and look pretty are as numerous as labourers who canswing a pick. She found there was no discrimination between oneand the other of applicants, save as regards a conventionalstandard of prettiness and form. Their own opinion or knowledgeof their ability went for nothing.
3、 Mrs. Henry Spiker was this lady's name; and her husband was there too: so cold a man, that his head, instead of being grey, seemed to be sprinkled with hoar frost. Immense deference was shown to the Henry Spikers, male and female; which Agnes told me was on account of Mr. Henry Spiker being solicitor to something Or to Somebody, I forget what or which, remotely connected with the Treasury.
`Then why not change it?'[回复]
So Ulysses slept in a bed placed in a room over the echoing gateway;but Alcinous lay in the inner part of the house, with the queen hiswife by his side.[回复]