The Convention of the Governors of the different States, called for the purpose of devising some means for the relief of the difficulties under which the people are now laboring, had met, and, without taking any decisive action on the subject, adjourned, causing great dissatisfaction. Don Fernando Ramnez has accepted the appointment of Minister of Foreign Affairs, and is charged with the formation of a new Cabinet. The Tehuantepec question engages public attention to a very great degree. The press represent that if the Americans are allowed to construct a railroad across the isthmus, the adjoining country will be colonized, revolutionized, and annexed to the United States, and that another large and valuable department will thus be lost to Mexico. It is stated that the Government has sent 3000 men to defend the isthmus against the Americans, but this we are inclined to doubt. A revolution has broken out in Northern Mexico which, thus far, has proved entirely successful. It commenced at Camargo, where the Patriots attacked the Mexicans. The Patriots came off victorious, having taken the town by storm, with a loss on the side of the Mexicans of 60. The Government troops were intrenched in a church, with artillery. The people of the town had held a meeting, at which it was resolved to accept the pronunciamiento issued by the Revolutionists. The Mexican troops stationed there were allowed to march out of the town with the honors of war. The Revolutionists were determined to defend the place. The Revolutionists are commanded by Carabajal, who has also with him two companies of Texans. At the last accounts they were marching on Matamoras and Reynosa. Gen. Avalos, who is at Matamoras, has only 200 troops. He had made a requisition on the city for 2000, but the city refused to raise a single man. The plan of the Revolutionists was a pronunciamiento which was widely circulated. The pronunciamiento pronounces "death to tyrants." The reasons given for the revolt are: 1st. The utter failure of the Mexican Government to protect the northern Mexican States from Indian depredations. 2d. The unjust, unequal, prohibitory system of duties, which operates most destructively on the interests of the people of the frontier. 3d. The despotic power exerted by the Federal Government over the rights and representation of several States. Beside Camargo, Mier, Tampico, and several other towns were in the hands of the insurgents. A report having reached Matamoras that the invaders were preparing to march upon them, a large number of the inhabitants, including all the woman and children, fled, leaving only two hundred and fifty men in the town. CENTRAL AMERICA.