Treaties with their respective Governments upon the following basis:– The Argentine Republic shall be divided from the Republic of Paraguay by the Rivers Parana and Paraguay, until meeting the boundaries of the Empire of Brazil, these being on the right margin of the River Paraguay, the Bahia Negra. The Empire of Brazil shall be divided from the Republic of Paraguay on the side of the Parana by the first river below the Salto de las Siete Cahidas, which, according to the recent map by Manchez, is the Igurey, and from the mouth of the Igurey and its course upwards until reaching its sources. On the side of the left bank of the Paraguay by the River Apa from its mouth to its sources. In the interior from the summits of the mountain of Maracayú, the streams on the east belonging to Brazil, and those on the west to Paraguay, and drawing lines as straight as possible from the said mountain to the sources of the Apa and of the Igurey. ARTICLE XVII The allies guarantee to each other reciprocally the faithful fulfilment of the agreements, arrangements, and Treaties that are to be celebrated with the Government that shall be established in Paraguay, in virtue of what is agreed upon by the present Treaty of Alliance, which shall always remain in its full force and vigour to the effect that these stipulations be respected and executed by the Republic of Paraguay. In order to obtain this result they do agree that, in the case that one of the High Contracting Parties should be unable to obtain from the Government of Paraguay the fulfilment of what is agreed upon, or that this Government should attempt to annul the stipulations adjusted with the Allies, the other shall employ actively their exertions to cause them to be respected. If these exertions should be useless, the allies will concur with all their means in order to make effective the execution of what is stipulated. ARTICLE XVIII This Treaty shall be kept secret until the principal object of the alliance shall be obtained. ARTICLE XIX The stipulations of this Treaty which do not require legislative authorization for their ratification, shall begin to take effect so soon as they are approved by the respective Governments, and the others from the exchange of the ratifications, which shall take place within the term of forty days counted from the