_18th_.--The city has been thrown into considerable agitation to-day, by the knowledge, that yesterday the ministry of the Andradas ceased. It appears that a few days ago, I believe on the 16th, an unknown person presented a letter at the palace-door, and told the servant who received it, that his life should not be safe if he did not deliver it into the Emperor's own hand. The letter was delivered accordingly, and read; upon which His Imperial Majesty sent for Jose Bonifacio: they remained closeted for a length of time, and the result of the conference was, that Jose Bonifacio resigned his employment; and Brazil has lost an able minister, and the Emperor a zealous servant. It is rumoured that the letter was written from St. Paul's, and contained at least 300 signatures of persons complaining of the Andradas' tyrannical conduct in that province; particularly imprisoning persons who had opposed the election of certain members of the assembly, and ordering others, on various pretexts, to repair to Rio, where they had been kept away from their families. These things, however, are capable of a favourable interpretation; and, in such stormy times, some severity may have been necessary, or, indeed, the zeal of the minister may have carried him too far.[114] [Note 114: The discussions in the assembly of the 9th of May throw much light on this transaction.] However that may be, the resignation of Jose Bonifacio is certain; and not less so that of his brother, Martim Francisco, whose unimpeachable integrity at the head of the treasury it will not be easy to supply. The conjectures, reasonings, and reports, on these subjects, are, of course, very various. The most general idea is, that the Andradas are overpowered by a republican party in the assembly; which, though small, has a decided plan, and works accordingly; and, oddly enough, their fall is said to have been brought about by an attempt, on their part, to get rid of old monarchy men. Monis Tavares, a clever man, whose name will be remembered in the sittings of the Lisbon Cortes as an advocate for Brazil, proposed in an early sitting of the assembly, May 22, the absolute expulsion from Brazil of all persons born in Portugal. The proposal gave rise to a warm discussion, and was negatived. This defeat was the signal for all the Portuguese party, and they are not weak, to join with the republicans to overthrow the Andradas; and they have succeeded. Such is the view taken of this business by many intelligent persons. However the fact may be, the Emperor's feeling to disclaim all tyranny or connivance at tyranny, is praiseworthy; but a well-wisher to Brazil may be permitted to desire that such able men had proved their innocence to his satisfaction, and had retained their situations. This evening the Emperor has circulated the following address to his people:-- "Inhabitants of Brazil,