The mines, the great source of revenue to the crown of Portugal, and in the government of this place the great cause of jealousy both of strangers and of the inhabitants, were situated more than a week's journey hence, except some which had been lately discovered in the mountains near the town. Sufficient employment was found for the Mint, at which was struck all the coin that was current here, besides what was sent to Europe. The diamond-trade had been for some time taken into the hands and under the inspection of Government; but the jewellers' shops abounded with topazes, chrysolites, and other curious and precious stones. Beside the forts at the entrance of the harbour, there were two others of considerable force, one at either extremity of the place, constructed on islands in the bay. On an eminence behind the town, and commanding the bay, stood the Citadel. The troops in these works were relieved regularly on the last day of every month, previous to which all the military in the garrison passed in review before the viceroy in the quadrangle of the palace. About 250 men with officers in proportion were on duty every day in the town, distributed into different guards, from which sentinels were stationed in various parts of the place, who, to keep themselves alert, challenge and reply to each other every quarter of an hour. In addition to these sentinels, every regiment and every guard sent parties through the streets, patrolling the whole night for the preservation of peace and good order. An officer from each regiment attended every evening at the palace to take orders for the following day, which were delivered by the adjutant of orders, who himself received them directly from the viceroy. At the palace every transaction in the town was known, and thence, through the adjutant of orders, the inhabitants received the viceroy's commands and directions whenever he thought it necessary to guide or regulate their conduct. The regiments that came here from Lisbon had been twenty years in the country, although, on leaving Europe, they were promised to return at the expiration of the third. They were recruited in the Brazils; and such officers as might wish to visit Portugal obtained leave of absence on application to the court, through the viceroy. To each regiment is attached an officer, who is styled an Auditor, and whose office is to inquire into all crimes committed by the soldiers of his regiment. If he sees it necessary, he has power to inflict corporal punishment, or otherwise, as the offender may in his judgment merit; but his authority does not extend either to life or limb. For exercising his employment he is allowed the pay of a captain of infantry.