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 If the security of life and property at the South must for ever be dependent on the thoroughness with which the negro population is prevented from acquiring knowledge; from thinking of themselves and for themselves, it will never be felt to be greater than it is to-day. Efforts made to increase this security will of themselves occasion agitation, and agitation must counteract those efforts. Knowledge, knowledge of what is going on elsewhere, of the condition of men elsewhere, of what is thought elsewhere, must have increased currency with every class of mankind in all parts of this continent, as it increases in population, and the movements of its population increase in activity and importance. No human laws, embargoes, or armies and navies can prevent it. Do our utmost, we cannot go back of the steam-engine, the telegraph, the cotton-gin, and the cylinder press. The South has admitted steamboats and railroads. It was not practicable to stop with these, and bar out all the rest that is peculiar to the nineteenth century. Is it practicable to admit the machinery of modern civilized life, and not stir up its free people? Is it practicable to stir up its intermediate class, and keep its lowest torpid? Assuredly the security which depends upon preventing either of these steps can never be permanently increased; spite of all possible further extension of slave territory, and dispersion and disconnection of plantations, it must gradually lessen. As it lessens, the demand upon the nation to supply new grounds of security must increase—increase continually, until at length, this year, next year, or another, they conclusively and hopelessly fail. It may cost us much or it may cost us little to reach that point, but it is inevitably to be reached. It may be after long and costly civil war, or longer and more costly foreign wars, or it may be peaceably, sensibly, and soon, but it must come. The annexation of Cuba, interna