There are territories, such as Southwest Africa and certain of the South Pacific Isles, which, owing to the sparseness of the population, or their small size, or their remoteness from the centers of civilization, or their geographical contiguity to the mandatory State and other circumstances, can be best administered under the laws of the mandatory States as integral portions thereof, subject to the safeguards above mentioned in the interests of the indigenous population. [Sidenote: Mandatory's annual report.] In every case of mandate, the mandatory State shall render to the League an annual report in reference to the territory committed to its charge. The degree of authority, control, or administration, to be exercised by the mandatory State, shall, if not previously agreed upon by the high contracting parties in each case, be explicitly defined by the Executive Council in a special act or charter. [Sidenote: The mandatory commission.] The high contracting parties further agree to establish at the seat of the League a mandatory commission to receive and examine the annual reports of the mandatory powers, and to assist the League in insuring the observance of the terms of all mandates. ART. XX.--The high contracting parties 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 to that end agree to establish as part of the organization of the League a permanent bureau of labor. [Sidenote: Transportation and commerce.] ART. XXI.--The high contracting parties agree that provision shall be made through the instrumentality of the League to secure and maintain freedom of transit and equitable treatment for the commerce of all States members of the League, having in mind, among other things, special arrangements with regard to the necessities of the regions devastated during the war of 1914-1918. [Sidenote: International bureaus to be placed under League.] ART. XXII.--The high contracting parties agree to place under the control of the League all international bureaus already established by general treaties, if the parties to such treaties consent. Furthermore, they agree that all such international bureaus to be constituted in future shall be placed under control of the League. [Sidenote: Treaties to be registered with the League.] ART. XXIII.--The high contracting parties agree that every treaty or international engagement entered into hereafter by any State member of the League shall be forthwith registered with the Secretary General and as soon as possible published by him, and that no such treaty or international engagement shall be binding until so registered. [Sidenote: Reconsideration of treaties.]