accounts from the mining districts continue to be encouraging. From the SANDWICH ISLANDS, we have news to the 10th of April. Parliament was opened on the 7th. In the Society group, the people of Raiatea have rebelled against the authority of Queen Pomare. She had just appointed one of her sons to the government of Raiatea, but before his arrival the inhabitants had assembled, as those of the others had previously done, elected a Governor of their own choice for two years, and formed a Republic of confederated States, each island to constitute a separate State. Military preparations had been made to resist any attempt on the part of the Queen to regain her authority. It was said that she had applied ineffectually for assistance to the French, English, and American authorities at Tahiti. There seemed to be little doubt that all the Leeward islands would establish their independence. MEXICO. We have news from the city of Mexico to the 10th of May. The news of the rejection of the Tehuantepec treaty is fully confirmed. The vote was almost unanimous against it, and is fully sustained by the press and public sentiment. The Government, however, has appointed Mr. Larrainzas a special envoy to the United States, and has given him, it is said, instructions for arranging this difficulty upon some mutually-satisfactory basis. It is reported that Mexico is not unwilling to grant a right of way across the Isthmus, but that the very large grants of land embraced in the original treaty led to its rejection. Upon this point, however, nothing definite is known.----A difficulty has arisen between the Legislature of the State of Vera Cruz and the Mexican Congress. The former insists upon a greater reduction of the tariff of 1845 than the ten per cent. allowed by the National Senate. The Senate will allow this reduction of ten per cent., but refuses to do away with any of the duties. The Lower House of Congress, on the contrary, is in favor of abolishing some of the duties. Zacatecas and Durango, besides being ravaged by the savages, are suffering from the visitation of a general famine. SOUTH AMERICA. From BUENOS AYRES we have news to the 5th of April. The upper provinces have sent in felicitations to General Urquiza upon his accession to power. It is thought that the provinces will unite in a General Confederacy, under a Central Government, framed upon the model of that of the United States: and it is suggested that General Urquiza will probably aspire to the position of President. He is conducting affairs firmly and successfully, though against great difficulties in the province, and has issued several proclamations calling upon the people to sustain him in maintaining order and tranquillity. It is said that a rupture has occurred between the Brazilian authorities and the Oriental government, in regard to the execution of late treaties made and ratified by President Suarez. Negotiations had been suspended.