The South Carolina politicians have hitherto shown themselves adroit managers, shrewd in detecting and profiting by the weaknesses of men; but their experience has not been of a kind to give them practical wisdom in that vastly more important part of government which depends for success on common sense and business habits. The members of the South Carolina Convention have probably less knowledge of political economy than any single average Northern merchant whose success depends on an intimate knowledge of the laws of trade and the world-wide contingencies of profit and loss. Such a man would tell them, as the result of invariable experience, that the prosperity of no community was so precarious as that of one whose very existence was dependent on a single agricultural product. What divinity hedges cotton, that competition may not touch it,--that some disease, like that of the potato and the vine, may not bring it to beggary in a single year, and cure the overweening conceit of prosperity with the sharp medicine of Ireland and Madeira? But these South Carolina economists are better at vaporing than at calculation. They will find to their cost that the figures of statistics have little mercy for the figures of speech, which are so powerful in raising enthusiasm and so helpless in raising money. The eating of one's own words, as they must do, sooner or later, is neither agreeable nor nutritious; but it is better to do it before there is nothing else left to eat. The secessionists are strong in declamation, but they are weak in the multiplication-table and the ledger. They have no notion of any sort of logical connection between treason and taxes. It is all very fine signing Declarations of Independence, and one may thus become a kind of panic-price hero for a week or two, even rising to the effigial martyrdom of the illustrated press; but these gentlemen seem to have forgotten that, if their precious document should lead to anything serious, they have been signing promises to pay for the State of South Carolina to an enormous amount. It is probably far short of the truth to say that the taxes of an autonomous palmetto republic would be three times what they are now. To speak of nothing else, there must be a military force kept constantly on foot; and the ministers of King Cotton will find that the charge made by a standing army on the finances of the new empire is likely to be far more serious and damaging than can be compensated by the glory of a great many such "spirited charges" as that by which Colonel Pettigrew and his gallant rifles took Fort Pinckney, with its garrison of one engineer officer and its armament of no guns. Soldiers are the most costly of all toys or tools. The outgo for the army of the Pope, never amounting to ten thousand effective men, in the cheapest country in the world, has been half a million of dollars a month. Under the present system, it needs no argument to show that the