In conformity with the principles of the right of natives as recognized by the signatory Powers, the slave trade being forbidden, and operations, which on land or sea supply slaves for the trade, being equally held to be forbidden, the Powers, which exercise or will exercise rights of sovereignty or influence in the territories forming the basin of the Congo, declare that these territories shall serve neither for the place of sale, nor the way of transit for traffic in slaves of any race whatsoever. Each of the Powers undertakes to employ every means that it can to put an end to the trade and to punish those who engage in it. * * * * * CHAPTER III. DECLARATION RELATING TO THE NEUTRALITY OF THE TERRITORIES COMPRISED IN THE SAID BASIN OF THE CONGO. ARTICLE X. In order to give a new guarantee of security for commerce and industry, and to encourage by the maintenance of peace the development of civilization in the countries mentioned in Article I, or placed under the system of free trade, the High Parties signatory to the present Act, and those who will accept the same, hereby undertake to respect the neutrality of the territories or parts of the territories dependent on the said countries, comprising therein the territorial waters, for so long as the Powers, which exercise, or will exercise, the rights of sovereignty or protectorate over the territories, avail themselves of the right to proclaim them neutral, and fulfill the duties that neutrality implies. ARTICLE XI. In cases where a Power exercising the rights of sovereignty or protectorate in the countries as mentioned in Article I, and placed under the system of free trade, shall be involved in war, the High Parties signatory to the present Act, and those who will accept the same, hereby engage to use their good officers so that the territories belonging to that Power, and comprised within the said boundaries where free trade exists, shall, by the mutual consent of that Power and of the other, or others, of the belligerent parties, be held to be neutral, for so long as the war lasts, and considered as belonging to a non-belligerent state, the belligerent parties will then abstain from extending hostilities into such neutralized territories as well as from using them as a base for operations of war. ARTICLE XII. In the event of a serious disagreement originating on the subject, or arising within the limits of the territories mentioned in Article I and placed under the system of freedom of trade, between Powers signatory to the present Act, or Powers accepting the same, these Powers undertake, before appealing to arms, to have recourse to the mediation of one or several of the friendly Powers. Under the said circumstances the said Powers reserve to themselves the option of proceeding to arbitration. * * * * * CHAPTER IV. ACT OF THE NAVIGATION OF THE CONGO. ARTICLE XIII.