The link to fulltext under Treaty section is a scanned copy of the original text. The Avalon Project at Yale provides plain text version:

CONVENTION ON RIGHTS AND DUTIES OF STATES

The Governments represented in the Seventh International Conference of American States:

Wishing to conclude a Convention on Rights and Duties of States, have appointed the following Plenipotentiaries:(List of Countries)

Who, after having exhibited their Full Powers, which were found to be in good and due order, have agreed upon the following:

ARTICLE 1

The state as a person of international law should possess the following qualifications: a ) a permanent population; b ) a defined territory; c ) government; and d) capacity to enter into relations with the other states.