507 



(b) initial contributions to be paid in the course of the 

 year; 



(c) annual contributions, if required to balance the budget; 



(d) any other income. 



2. For each person referred to in Article 10 the amount of his 

 annual contribution shall be determined by the Assembly and shall 

 be calculated in respect of each Contracting State: 



(a) in so far as the contribution is for the satisfaction of pay- 

 ments referred to in paragraph l(i) (a) and (b) on the basis of a 

 fixed sum for each ton of contributing oil received in the relevant 

 State by such persons during the preceding calendar year; and 



(b) in so far as the contribution is for the satisfaction of pay- 

 ments referred to in paragraph l(i) (c) of this Article on the 

 basis of a fixed sum for each ton of contributing oil received by 

 such person during the calendar year preceding that in which 

 the incident in question occurred, provided that State was a 

 party to this Convention at the date of the incident. 



3. The sums referred to in paragraph 2 above shall be arrived at 

 by dividing the relevant total amount of contributions required b}'' 

 the total amount of contributing oil received in all Contracting States 

 in the relevant year. 



4. The Assembly shall decide the portion of the annual contribution 

 which shall be immediately paid in cash and decide on the date of 

 payment. The remaining part of each annual contribution shall be 

 paid upon notification by the Director. 



5. The Director may, in cases and in accordance with conditions to 

 be laid down in the Internal Regulations of the Fund, require a con- 

 tributor to provide financial security for the sums due from him. 



6. Any demand for payments made under paragraph 4 shall be 

 called rateably from all individual contributors. 



Article 13 



1. The amount of any contribution due under Article 12 and which 

 is in arrear shall bear interest at a rate which shall be determined by 

 the Assembly for each calendar year provided that difl'erent rates may 

 be fixed for different circumstances. 



2. Each Contracting State shall ensure that any obligation to con- 

 tiibute to the Fund arising under this Convention in respect of oil 

 received within the territory of that State is fulfilled and shall take 

 any appropriate measures under its law, including the imposing of 

 such sanctions as it may deem necessary, with a view to the effective 

 execution of any such obligation; provided, however, that such 

 measures shall only be directed against those persons who are under 

 an obligation to contribute to the Fund. 



3. Where a person who is liable in accordance with the provisions of 

 Articles 10 and 11 to make contributions to the Fund does not fulfil 

 his obligations in respect of any such contribution or any part thereof 

 and is in arrear for a period exceeding three months, the Director shall 

 take all api)ropriate action against such person on behalf of the Fund 

 with a view to the recovery of the amount due. However, where the 

 defaulting contributor is manifestly insolvent or the circumstances 

 otherwise so warrant, the Assembly may, ui)on recommendation of 



