A permanent commission shall be constituted to receive and examine the annual reports of the mandatories and to advise the Council on all matters relating to the observance of the mandates. Article Twenty-Three [Humanitarian Provisions; Freedom of Transit] Subject to and in accordance with the provisions of international conventions existing or hereafter to be agreed upon, the members of the League (a) will endeavor to secure and maintain fair and humane conditions of labor for men, women and children both in their own countries and in all countries to which their commercial and industrial relations extend, and for that purpose will establish and maintain the necessary international organizations; (b) undertake to secure just treatment of the native inhabitants of territories under their control; (c) will entrust the League with the general supervision over the execution of agreements with regard to the traffic in women and children, and the traffic in opium and other dangerous drugs; (d) will entrust the League with the general supervision of the trade in arms and ammunition with the countries in which the control to this traffic is necessary in the common interest; (e) will make provision to secure and maintain freedom of communication and of transit and equitable treatment for the commerce of all members of the League. In this connection the special necessities of the regions devastated during the war of 1914-1918 shall be in mind; (f) will endeavor to take steps in matters of international concern for the prevention and control of disease. Article Twenty-Four [Control of International Bureaus and Commissions] There shall be placed under the direction of the League all international bureaus already established by general treaties if the parties to such treaties consent. All such international bureaus and all commissions for the regulation of matters of international interest hereafter constituted shall be placed under the direction of the League. In all matters of international interest which are regulated by general conventions but which are not placed under the control of international bureaus or commissions, the Secretariat of the League shall, subject to the consent of the Council and if desired by the parties, collect and distribute all relevant information and shall render any other assistance which may be necessary or desirable. The Council may include as part of the expenses of the Secretariat the expenses of any bureau or commission which is placed under the direction of the League. Article Twenty-Five [The Red Cross and International Sanitation] The members of the League agree to encourage and promote the establishment and cooperation of duly authorized voluntary national Red Cross organizations having as purposes improvement of health, the prevention of disease and the mitigation of suffering throughout the world. Article Twenty-Six [Amendments of the Covenant; Right of Dissent]