There is a great deal of uneasiness to-day. The Portuguese commander-in-chief of the troops, General Avilez, has demanded and received his discharge. It is said, perhaps untruly, that his remonstrance to the Prince against his remaining here has been ungentlemanlike and indecent. I hear the troops will not consent to his removal, and they are particularly incensed that the choice of a successor should fall on General Curado, a Brazilian, who, it is said, will be called from St. Paul's to succeed Avilez. He is a veteran, who has commanded with distinction in all the campaigns on the southern frontier, and his actions are better known among his countrymen than those distant battles in Europe, on which the Portuguese officers of every rank are apt to pride themselves here, however slight the share they had in them, to the annoyance of the Brazilians. _12th_.--Yesterday the military commission for the government of the army here was broke up, and Curada appointed commander-in-chief, and minister of war. The Portuguese General Avilez made his appearance at the barracks of the European soldiers to take leave of them; they were under arms to receive him, and vowed not to part with him, or to obey another commander, and were with difficulty reduced to such order as to promise tolerable tranquillity for the day at least. It is said, that as it had been understood that they had expressed some jealousy, because the guard of honour at the opera-house had been for the two last evenings composed of Brazilians, the Prince sent to the Portuguese barracks for the guard of last night, but that they refused to go; saying, that as His Royal Highness was so partial to the Brazilians, he had better continue to be guarded by them. I am not sure this is true, but from the circumstances of the day it is not improbable.