During this important and absorbing negotiation, other matters of less moment, but still of considerable consequence, had been met by Mr. Webster, and successfully disposed of. He made a treaty with Portugal, respecting duties on wines; he carried on a long correspondence with our minister to Mexico in relation to certain American prisoners; he vindicated the course of the United States in regard to the independence of Texas, teaching M. de Bocanegra, the Mexican Secretary of State, a lesson as to the duties of neutrality, and administering a severe reproof to that gentleman for imputing bad faith to the United States; he conducted the correspondence, and directed the policy of the government in regard to the troubles in Rhode Island; he made an effort to settle the Oregon boundary; and, finally, he set on foot the Chinese mission, which, after being offered to Mr. Everett, was accepted by Mr. Cushing with the best results. But his real work came to an end with the correspondence with General Cass at the close of 1842, and in May of the following year he resigned the secretaryship. In the two years during which he had been at the head of the cabinet, he had done much. His work added to his fame by the ability which it exhibited in a new field, and has stood the test of time. In a period of difficulty, and even danger, he proved himself singularly well adapted for the conduct of foreign affairs,--a department which is most peculiarly and traditionally the employment and test of a highly-trained statesman. It may be fairly said that no one, with the exception of John Quincy Adams, has ever shown higher qualities, or attained greater success in the administration of the State Department, than Mr. Webster did while in Mr. Tyler's cabinet.