525 



(b) The Organisation shall inform all Contracting Parties of any 

 request made for a special meetino; under Article XIV and of any 

 amendments adopted at meetings of the Parties and of the date on 

 which each such amendment enters into force for each Party. 



2. Amendments to the Annexes will be based on scientific or tech- 

 nical considerations. Amendments to the Annexes approved by a two- 

 thirds majority of those present at a meeting called in accordance with 

 Article XIV shall enter into force for each Contracting Party immedi- 

 ately on notification of its acceptance to the Organisation and 100 days 

 after approval by the meeting for all other Parties except for those 

 which before the end of the 100 days make a declaration that they are 

 not able to accept the amendment at that time. Parties should en- 

 deavour to signify their acceptance of an amendment to the Organisa- 

 tion as soon as possible after approval at a meeting. A Party may at 

 any time substitute an acceptance for a previous declaration of objec- 

 tion and the amendment previously objected to shall thereupon enter 

 into force for that Party. 



3. An acceptance or declaration of objection under this Article shall 

 be made by the deposit of an instrument with the Organisation. The 

 Organisation shall notify all Contracting Parties of the receipt of such 

 instruments. 



4. Prior to the designation of the Organisation, the Secretarial func- 

 tions herein attributed to it, shall be performed temporarily by the 

 Government of the United Kingdom of Great Britain and Northern 

 Ireland, as one of the depositaries of this Convention. 



Article XVI 



This Convention shall be open for signature by any State at London, 

 Mexico City, Moscow and Washington from 29 December 1972 until 

 31 December 1973. 



Article XVII 



This Convention shall be subject to ratification. The instruments of 

 ratification shall be deposited with the Governments of Mexico, the 

 Union of Soviet Socialist Republics, the United Kingdom of Great 

 Britain and Northern Ireland, and the United States of America. 



Article XVIII 



After 31 December 1973, this Convention shall be open for accession 

 by any State. The instruments of accession shall be deposited with the 

 Governments of Mexico, the Union of Soviet Socialist Republics, the 

 United Kingdom of Great Britain and Northern Ireland, and the 

 United States of America. 



Article XIX 



1. This Convention shall enter into force on the thirtieth day fol- 

 lowing the date of deposit of the fifteenth instrument of ratification or 

 accession. 



2. For each Contracting Party ratifying or acceding to the Con- 

 vention after the deposit of the fifteenth instrument of ratification or 

 accession, the Convention shall enter into force on the thirtieth day 



