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Ertract of Letter from Comraodore M.

 Y. WooLsEy, to the Secretary of ttc

 .Naru, dated U. s. Ship Natche1, Rio

 de Jaae:ro, April 5ih. 1854.

 Political affairs in Brazil, as well as at inc River Plata, are perfectly tranqnll; and see nothing at present likely to disturb that tranquility. When left Mortevldeo, General Rosas with his army from the ln- dian war (now at an end) was hourly ex- pected at Buenos Ayres. Doctor Francla, the Paraguay, had marched over into the Province of Corrientes, and had taken and fortified two points on the river, from whence his commerce had been annoyed. This appears to be the object of his move ,uef,.-and one which t was supposed would not affect the general tranquility.

 Simeon nfariihs who robbed the Mechan- 'ics and Traders Bank, arrived at Tampico oh the 27th April, in the schooner Bonita. He remained there q few days, and then started for the city of Mexico. The night previous to his departures he lost $500 at play. MT. Nj. Carson, the agent of the Bank; arrived at Tampico four days after Martin had left. Mr. c. had procured an order for his anestaton, and the government Ihad given him q detachment of soldiers to 1 follow in pursuit. La. .adrs'f'ssr

 1 4 gentleman from New Orleans informs us. that Martin has been arrested, and brought back 10 New Orleans, .o await his ttrial.-Editor Reg.