Latest from Rio Joneiro.-Aceounts from Rio Janeiro to the 23d January, received at Baltimore, state that the U. $. frigate Hudson was expected to sail for the River Plata in a few days.

 X letter to the editors of the Baltl- more American, says

 There is aH evident increase of inter est in the affairs of Government among inc people, and some measures have been taken to correct abuses of office. Our currency is still depreciated, but a- bout three millions of bank paper is soon to be taken from circulation, and cir eumstances seem to warrant confl- dence in government taking measures to improve 1t when the Legislature meets.