England has established twenty-four treaties with native kings, chiefs, or powers, for the suppression of the slave-trade; seventeen of these are with chiefs whose territories have fallen under the influence of the Republic of Liberia and Cape Palmas. The influence of these governments has now replaced that of England, by sweeping the slave-trade from their territory of about six hundred miles. The great proportion of recaptured slaves, chiefly men and boys, who have been thrown into the population of Sierra Leone, has loaded it heavily. Of these, altogether not less than sixty thousand have, at different times, been introduced; yet, with the original colonists--the Novascotians, Canadians and the Maroons from Jamaica--the whole do not now extend beyond forty-five thousand; still, Sierra Leone has long been a focus of good emanations. It embraces a territory small compared with Liberia. The government is repressive of native energy, on account of the constant superintendence of white men, and the subordination of the colony to a distant and negligent government. One momentous effect of its influence, however, has come permanently forward, tending to carry rapid improvement widely over the western regions of Africa. These recaptured slaves, and their descendants, many of them, are returning to their native lands, elevated in character by the instruction they have received. Three thousand of them are now settled among their brethren of the Yoruba tribe, near the mouth of the Niger, and there, superintended by two or three missionaries, are sending abroad, by their influence and example, the light of Divine truth. Sierra Leone and the naval squadrons have rendered great service to Liberia. It is perfectly obvious that the colony could not have existed if left to itself under the old system of pirating and slave-trading. Those who did not spare European forts, would have had no scruple at plundering and extinguishing such opponents of their traffic. It must in justice be admitted, that a fair surrender of what might, in reality, be considered as conquered territory, has been made by England to Liberia. The instances of such transactions show a greatly advanced state of morality in the public dealings of nations, and in this, even, the African has begun to partake. Sierra Leone was founded on the 9th of May, 1787, by a party of four hundred negroes, discharged from the army and navy. They were joined by twelve hundred from Nova Scotia in 1792. In 1849, the country around the river Sherboro, intervening between Sierra Leone and Monrovia, had been carrying on a war for about seven years, and at length commenced plundering the canoes of the Sierra Leone people. The acting governor soon brought them to terms. This vexed the slavers at the Gallinas, who had long been an annoyance to the Liberian authorities. It was the slavers’ policy to keep up the excitement and strife, that they might in the mean time drive a brisk trade unmolested.