Events of considerable importance have recently transpired in China. The military operations carried on against that Empire by the English Government have been terminated by a treaty, according to the terms of which four important ports hitherto shut against foreign commerce are to be open to British merchants, viz, Amoy, Foo-Choo-Foo, Ningpo, and Chinghai. It can not but be interesting to the mercantile interest of the United States, whose intercourse with China at the single port of Canton has already become so considerable, to ascertain whether these other ports now open to British commerce are to remain shut, nevertheless, against the commerce of the United States. The treaty between the Chinese Government and the British commissioner provides neither for the admission nor the exclusion of the ships of other nations. It would seem, therefore, that it remains with every other nation having commercial intercourse with China to seek to make proper arrangements for itself with the Government of that Empire in this respect. The importations into the United States from China are known to be large, having amounted in some years, as will be seen by the annexed tables, to $9,000,000. The exports, too, from the United States to China constitute an interesting and growing part of the commerce of the country. It appears that in the year 1841, in the direct trade between the two countries, the value of the exports from the United States amounted to $715,000 in domestic produce and $485,000 in foreign merchandise. But the whole amount of American produce which finally reaches China and is there consumed is not comprised in these tables, which show only the direct trade. Many vessels with American products on board sail with a primary destination to other countries, but ultimately dispose of more or less of their cargoes in the port of Canton. The peculiarities of the Chinese Government and the Chinese character are well known. An Empire supposed to contain 300,000,000 subjects, fertile in various rich products of the earth, not without the knowledge of letters and of many arts, and with large and expensive accommodations for internal intercourse and traffic, has for ages sought to exclude the visits of strangers and foreigners from its dominions, and has assumed for itself a superiority over all other nations. Events appear likely to break down and soften this spirit of nonintercourse and to bring China ere long into the relations which usually subsist between civilized states. She has agreed in the treaty with England that correspondence between the agents of the two Governments shall be on equal terms--a concession which it is hardly probable will hereafter be withheld from other nations.