The exchange of ratifications of the treaty with Mexico took place on the 30th of May, 1848. Within one year after that time the commissioner and surveyor which each Government stipulates to appoint are required to meet "at the port of San Diego and proceed to run and mark the said boundary in its whole course to the mouth of the Rio Bravo del Norte." It will be seen from this provision that the period within which a commissioner and surveyor of the respective Governments are to meet at San Diego will expire on the 30th of May, 1849. Congress at the close of its last session made an appropriation for "the expenses of running and marking the boundary line" between the two countries, but did not fix the amount of salary which should be paid to the commissioner and surveyor to be appointed on the part of the United States. It is desirable that the amount of compensation which they shall receive should be prescribed by law, and not left, as at present, to Executive discretion. Measures were adopted at the earliest practicable period to organize the "Territorial government of Oregon," as authorized by the act of the 14th of August last. The governor and marshal of the Territory, accompanied by a small military escort, left the frontier of Missouri in September last, and took the southern route, by the way of Santa Fe and the river Gila, to California, with the intention of proceeding thence in one of our vessels of war to their destination. The governor was fully advised of the great importance of his early arrival in the country, and it is confidently believed he may reach Oregon in the latter part of the present month or early in the next. The other officers for the Territory have proceeded by sea. In the month of May last I communicated information to Congress that an Indian war had broken out in Oregon, and recommended that authority be given to raise an adequate number of volunteers to proceed without delay to the assistance of our fellow-citizens in that Territory. The authority to raise such a force not having been granted by Congress, as soon as their services could be dispensed with in Mexico orders were issued to the regiment of mounted riflemen to proceed to Jefferson Barracks, in Missouri, and to prepare to march to Oregon as soon as the necessary provision could be made. Shortly before it was ready to march it was arrested by the provision of the act passed by Congress on the last day of the last session, which directed that all the noncommissioned officers, musicians, and privates of that regiment who had been in service in Mexico should, upon their application, be entitled to be discharged. The effect of this provision was to disband the rank and file of the regiment, and before their places could be filled by recruits the season had so far advanced that it was impracticable for it to proceed until the opening of the next spring.