Brazil.--Seignor Don Felix Decastro, agent from the Brazilian Government, visited our city last Saturday. He came by way of Washington city, where he had a conference with Lincoln and Seward on the subject of the blockade of Southern ports. Mr. D. expresses the opinion that this blockade will not be agreeable to his Government or that of France, and he is confident that the Brazilian Government sympathizes with the Southern Confederacy. Mr D. left on Monday evening for New Orleans, but will return in a few days.-- Montgomery Mail.