Is Missouri ambitious of political power?--a power which is slipping away from the South. The mode of acquiring it is found. We are not rash enough to attempt a description of our condition if the element of free labor were introduced. The earth would give up its hidden treasures at its bidding as the sea will give up its dead; and the soil would bloom more luxuriantly than if it drank the dews of Hermon nightly; ten thousand keels would vex our rivers, towns along their banks would grow into cities, and St. Louis would soon unite in itself the attributes of the greatest commercial manufacturing and literary metropolis in the world. Let it be remembered that we have every inanimate element of wealth and power within our limits, and that we require only labor--free labor--for we need not say that servile labor is inadequate. * * * There need be no pernicious agitation, and even if there should, it is the penalty which we cannot avoid paying at some time; and it is easier to pay it now, than in the future. Who that watches passing events and indications, is not sensible of the fact that great internal convulsions await the slave States? Better to grapple with the danger in time, if danger there be, and avert it, than wait until it becomes formidable. One thing is certain, or history is no guide: that is, that slavery cannot be perpetuated anywhere. An agitation now would be the effort of the social system to throw off a disease which had not touched its vitals; hereafter it would be the struggle for life with a mortal sickness. But we do not apprehend any agitation more violent than has been forced upon us for years by the pro-slavery politicians. Agitating the slavery question, has been their constant business, and nothing worse has resulted from it than their elevation to office--no very trifling evil, by the way--and the temporary subjugation of Kansas. Besides, we know that all the free States emancipated their slaves, and England and France theirs suddenly; and we have yet to learn that a dangerous agitation arose in any instance." In addition to all this, it is well known, and we thank Heaven for the fact and for the indication, that, at the election held for Mayor of St. Louis, in April, 1857, the Abolition candidate, himself a native of Virginia, was triumphantly elevated to the chief magistracy of the city. Three cheers for St. Louis! nine for Missouri! thirteen for the South. In reference to the late election in St. Louis, in which the Emancipation party triumphed, the Wheeling (Va.) _Intelligencer_ says:--