The history of Brazil, for the next thirty years, is composed of the mismanagement and decay of the Jesuit establishments; the enlargement of the mining districts, particularly in the direction of Mato Grosso; some disputes with the French on the frontier of Cayenne; and the more peaceful occupations of opening roads, and the introduction of new branches of commerce, and the improvement of the old. This tranquillity was for a moment interrupted by a conspiracy in the province of Minas Geraes, headed by an officer named Joaquim Jose de Silva Xavier, commonly called Tiradentes. The project of the conspirators was to form an independent republic in Minas, and, if possible, to induce Rio de Janeiro to unite with it. But their measures were most inadequate for the end proposed, and their conduct so imprudent, that, although there was a pretty general feeling of discontent on account of the taxes and some other grievances, the conspirators were all seized before they had formed anything like a party capable of resistance, much less of beginning the meditated revolution. The direct effects upon Brazil of the first thirteen years of the revolutionary war in Europe were confined to some slight disputes regarding the boundaries of the Portuguese and French Guiana, and concerning the limits of which, there was an article in Lord Cornwallis's negotiations with France, or rather the peace of Amiens in 1802. The indirect effects were greater. Being a good deal left to themselves, the colonists had leisure to discover what sort of cultivation and crops suited best with the climate, and were fittest for the market; and some branches of industry were introduced, and others improved, to the great advantage of the province. Foreign ships, and even fleets, had also begun to resort thither[18]: so that, though the ports had as yet been closed against foreign traders, the entrance of men of war, and such merchant ships as could find no others to refit in, introduced a virtual freedom, which it would afterwards have been impossible not to have confirmed. [Note 18: That under Sir H. Popham, on Sir D. Baird's expedition to the Cape of Good Hope, for instance, in 1805, and that of the French admiral, Guillaumez, in 1806.] The court of Portugal meanwhile, as if infatuated by the negotiations of France, consented to buy a disgraceful neutrality at the price of 1,000,000 of livres or 40,000_l._ per month, besides granting free entrance to French woollens into the kingdom.