SOUTH AMERICA.
In Buenos Ayres Rosas had been disturbed by the disaffection of General Urquiza. Rosas was making active preparations to oppose hostile attacks. The fortieth Anniversary of the Independence of Venezuela was celebrated at Caraccas with great enthusiasm. Venezuela remains perfectly tranquil. The insurrection in the Southern Provinces of New-Grenada has not yet been quelled, and the troops of the Government have suffered a defeat.