On Monday evening, April 18, 1927, his Excellency Octavio Mangabeira, Minister of Foreign Affairs of Brazil, formally opened the International Commission of American Jurists for the Codification of International Law, Public and Private, in the city of Rio de Janeiro, in the Monroe Palace, in the presence of the official representatives of seventeen of the twenty-one American Republics, having before them, as the bases of their labors,the projects of public and private international law drafted by the American Institute of International Law. On Friday afternoon, May 20, 1927, he formally adjourned the International Commission of American Jurists, which had to its credit twelve projects of public international law, and a code of private international law of no less than 439 articles, which the Commission had, within the short space of five weeks, put into shape primarily from the projects of the American Institute of International Law. It is the purpose of the present article to show how this Commission, the first official body which successfully and consciously endeavored to codify the two branches of international law, accomplished the purpose for which it had been created and assembled.