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of agreement. Each Member shall notify the Director-General of the action taken and if it does not accept such convention or agreement within the time limit, it will furnish a statement of the reasons for non-acceptance. In case of acceptance, each Member agrees to make an annual report to the Director-General in accordance with Chapter XIV. Article 21 The Health Assembly shall have authority to adopt regulations concerning : (a) Sanitary and quarantine requirements and other procedures designed to prevent the international spread of disease; (b) Nomenclatures with respect to diseases, causes of death and public health practices ; ([c) Standards with respect to diagnostic procedures for international use; (d) Standards with respect to the safety, purity, and potency of biological, pharmaceutical, and similar products moving in international commerce; (ie) Advertising and labelling of biological, pharmaceutical, and similar products moving in international commerce. Article 22 Regulations adopted pursuant to Article 21 shall come into force for all Members after due notice has been given of their adoption by the Health Assembly except for such Members as may notify the Director-General of rejection or reservations within the period stated in the notice. Article 23 The Health Assembly shall have authority to make recommendations to Members with respect to any matter within the competence of the Organization. CHAPTER VI The Executive Board Article 24 The Board shall consist of eighteen persons designated by as many Members. The Health Assembly, taking into account an equitable geographical distribution, shall elect the Members entitled to designate a person to serve on the Board. Each of these Members should appoint to the Board a person technically qualified in the field of health, who may be accompanied by alternates and advisers. Article 25 These Members shall be elected for three years and may be re-elected; provided that of the Members elected at the first