In SOUTH AMERICA there has been more than the usual amount of revolution. The President of Ecuador, General Nueva, left Querto on the seventeenth of July, to visit his family at Guayaquil. On approaching the city he was met by a military cavalcade, apparently for the purpose of escorting him in: but was seized by them, and hurried off to sea in a vessel lying in the river; the destination of the vessel, and the fate of the prisoner were unknown. General Urbina immediately entered upon the administration of affairs. In Chili, Don Manuel Montt has been elected President by a large majority. Advices from Montevideo to July thirtieth, state that Urguiza and Garzon passed the Uraguay on the twentieth with seven thousand five hundred men, and that General Servando Gomez at once went over to them from the army of Oribe with two thousand cavalry, some staff officers and one thousand extra horses. It is expected that all of Oribe's forces will desert him in the same manner. Garzon, who formerly served with Oribe, is very popular among his forces. A Brazilian army of twelve thousand men is marching to join Urguiza and Garzon. The war will now be carried into the territories of Buenos Ayres. It will doubtless be a most ferocious contest; with Rosas it is a matter of life and death; the power he has built up with such bloodshed and tyranny will either be destroyed utterly or confirmed by the result. In Peru, the best understanding is said to exist between the Legislative and Executive bodies in the Government. Movements are being made for the greater extension of freedom of trade, and for prohibiting the circulation of Bolivian money within the Republic. A revolution has broken out in the provinces of Antiochia and Popayan, in New-Grenada, which at the last advices (July twenty-fourth), was rapidly spreading over the country. The rising is headed by General Borrero, who took up arms with one thousand men, and has since received large accessions to his forces. General Borrero has the reputation of being an accomplished soldier and a sincere patriot. The city of Carthagena was thrown into great confusion by the reception of the intelligence, the militia being called out and the people supplied with arms. In Nicaragua a revolution has displaced the government, and M. Montenegro, who was elected successor of the deposed President, died in a few days after, and the chief of the opposite faction, General Muños, is probably now in authority.