With the Romans he maintained peace, but he tried to keep down the Ephthalites, who began to conquer eastern Iran.
Species of mungoose (Herpestes), species of otter, Mustela erminea, and two ferrets, one of them with tortoise-shell marks, tamed by the Afghans to keep down vermin; a marten (M.
The want of roads also, and many other disadvantages, tended to keep down the development of both commerce and industry.
Being a much better soldier than any of his opponents he gained victories at Sepulveda and Fuente de la Culebra, but his only trustworthy supporters were his Aragonese, who were not numerous enough to keep down Castile and Leon.
They are the home of myriads of sea-birds and one of the nesting-places of the bonxie, or great skua (Lestris cataractes), which used to be fostered by the islanders to keep down the eagles, and the eggs of which are still strictly preserved.
It is, in fact, as notorious an example of over-successful acclimatization as the rabbit, but in Hutton and Drummond's recent work on the New Zealand animals (London, 1905) it is not regarded in this light, considering that some very common exotic birds were needed to keep down the insects, which it certainly did.
Some of the best oranges in the world are grown, and exported; but sufficient care is not taken to keep down insect pests, and to replace old trees.
He was able by the influence he exerted to keep down the internal dissensions and insurrectionary outbreaks which had so greatly impeded for many years the development of the vast natural resources of the republic. With this object he had promoted the extension of railways so as to link the provinces with the great port of Buenos Aires, and to provide at the same time facilities for the rapid despatch of military forces to disturbed districts.
In order to keep down the expense of shunting the empty trains and engines to and from the platforms the carriage and locomotive depots should be as near the passenger station as possible; but often the price of land renders it impracticable to locate them in the immediate vicinity and they are to be found at a distance of several miles.
Economy in capital outlay and cheapness in construction is indeed the characteristic generally associated with light railways by the public, and implicitly attached to them by parliament in the act of 1896, and any simplifications of the engineering or mechanical features they may exhibit compared with the standard railways of the country are mainly, if not entirely, due to the desire to keep down their expenses.