The Burlingame treaty, of which the ratifications were exchanged at Peking November 23, 1869, recites as the occasion and motive of its negotiation by the two Governments that "since the conclusion of the treaty between the United States of America and the Ta Tsing Empire (China) of the 18th of June, 1858, circumstances have arisen showing the necessity of additional articles thereto," and proceeds to an agreement as to said additional articles. These negotiations, therefore, ending by the signature of the additional articles July 28, 1868, had for their object the completion of our treaty rights and obligations toward the Government of China by the incorporation of these new articles as thenceforth parts of the principal treaty to which they are made supplemental. Upon the settled rules of interpretation applicable to such supplemental negotiations the text of the principal treaty and of these "additional articles thereto" constitute one treaty from the conclusion of the new negotiations, in all parts of equal and concurrent force and obligation between the two Governments, and to all intents and purposes as if embraced in one instrument. The principal treaty, of which the ratifications were exchanged August 16, 1859, recites that "the United States of America and the Ta Tsing Empire, desiring to maintain firm, lasting, and sincere friendship, have resolved to renew, in a manner clear and positive, by means of a treaty or general convention of peace, amity, and commerce, the rules which shall in future be mutually observed in the intercourse of their respective countries," and proceeds in its thirty articles to lay out a careful and comprehensive system for the commercial relations of our people with China. The main substance of all the provisions of this treaty is to define and secure the rights of our people in respect of access to, residence and protection in, and trade with China. The actual provisions in our favor in these respects were framed to be, and have been found to be, adequate and appropriate to the interests of our commerce, and by the concluding article we receive the important guaranty that-- Should at any time the Ta Tsing Empire grant to any nation, or the merchants or citizens of any nation, any right, privilege, or favor, connected either with navigation, commerce, political or other intercourse, which is not conferred by this treaty, such right, privilege, and favor shall at once freely inure to the benefit of the United States, its public officers, merchants, and citizens. Against this body of stipulations in our favor and this permanent engagement of equality in respect of all future concessions to foreign nations the general promise of permanent peace and good offices on our part seems to be the only equivalent. For this the first article undertakes as follows: