Horse-thieves are numerous in this part of the country. A great number of horses are bred here; you see large herds of them feeding in the open prairies, and at this season of the year every full-grown mare has a colt running by her side. Most of the thefts are committed early in the spring, when the grass begins to shoot, and the horses are turned out on the prairie, and the thieves, having had little or no employment during the winter, are needy; or else in the autumn, when the animals are kept near the dwellings of their owners to be fed with Indian corn and are in excellent order. The thieves select the best from the drove, and these are passed from one station to another till they arrive at some distant market where they are sold. It is said that they have their regular lines of communication from Wisconsin to St. Louis, and from the Wabash to the Mississippi. In Ogle county they seem to have been bolder than elsewhere, and more successful, notwithstanding the notoriety of their crimes, in avoiding punishment. The impossibility of punishing them by process of law, the burning of the court-house at Oregon City last April, and the threats of deadly vengeance thrown out by them against such as should attempt to bring them to justice, led to the formation of a company of citizens, "regulators" they call themselves, who resolved to take the law into their own hands and drive the felons from the neighborhood. This is not the first instance of the kind which has happened in Illinois. Some twenty years since the southern counties contained a gang of horse-thieves, so numerous and well-organized as to defy punishment by legal means, and they were expelled by the same method which is now adopted in Ogle county. I have just learned, since I wrote the last sentence, that the society of regulators includes, not only the county of Ogle, but those of De Kalb and Winnebago, where the depredations of the horse-thieves and the perfect impunity with which they manage to exercise their calling, have exhausted the patience of the inhabitants. In those counties, as well as in Ogle, their patrons live at some of the finest groves, where they own large farms. Ten or twenty stolen horses will be brought to one of these places of a night, and before sunrise the desperadoes employed to take them are again mounted and on their way to some other station. In breaking up these haunts, the regulators, I understand, have proceeded with some of the formalities commonly used in administering justice. The accused party has been allowed to make his defense, and witnesses have been examined, both for and against him.