Slave insurrections are no more common now than they were before the Republican party was organized. What induced the Southampton insurrection, twenty-eight years ago, in which at least three times as many lives were lost as at Harper's Ferry? You can scarcely stretch your very elastic fancy to the conclusion that Southampton was "got up by Black Republicanism." In the present state of things in the United States, I do not think a general, or even a very extensive, slave insurrection is possible. The indispensable concert of action cannot be attained. The slaves have no means of rapid communication; nor can incendiary freemen, black or white, supply it. The explosive materials are everywhere in parcels; but there neither are, nor can be supplied, the indispensable connecting trains. Much is said by Southern people about the affection of slaves for their masters and mistresses; and a part of it, at least, is true. A plot for an uprising could scarcely be devised and communicated to twenty individuals before some one of them, to save the life of a favourite master or mistress, would divulge it. This is the rule; and the slave revolution in Haiti was not an exception to it, but a case occurring under peculiar circumstances. The Gunpowder Plot of British history, though not connected with slaves, was more in point. In that case, only about twenty were admitted to the secret; and yet one of them, in his anxiety to save a friend, betrayed the plot to that friend, and, by consequence, averted the calamity. Occasional poisonings from the kitchen, and open or stealthy assassinations in the field, and local revolts extending to a score or so, will continue to occur as the natural results of slavery; but no general insurrection of slaves, as I think, can happen in this country for a long time. Whoever much fears, or much hopes, for such an event, will be alike disappointed. In the language of Mr. Jefferson, uttered many years ago, "It is still in our power to direct the process of emancipation and deportation peaceably, and in such slow degrees as that the evil will wear off insensibly, and their places be, _pari passu_, filled up by free white labourers. If, on the contrary, it is left to force itself on, human nature must shudder at the prospect held up." Mr. Jefferson did not mean to say, nor do I, that the power of emancipation is in the Federal Government. He spoke of Virginia; and, as to the power of emancipation, I speak of the slaveholding States only. The Federal Government, however, as we insist, has the power of restraining the extension of the institution--the power to insure that a slave insurrection shall never occur on any American soil which is now free from slavery.