Her Majesty's Government and the Government of the South African Republic will each appoint a person to proceed together to beacon off the amended south-west boundary as described in Article 1 of this Convention; and the President of the Orange Free State shall be requested to appoint a referee to whom the said persons shall refer any questions on which they may disagree respecting the interpretation of the said Article, and the decision of such referee thereon shall be final. The arrangement already made, under the terms of Article 19 of the Convention of Pretoria of the 3rd August 1881, between the owners of the farms Grootfontein and Valleifontein on the one hand, and the Barolong authorities on the other, by which a fair share of the water supply of the said farms shall be allowed to flow undisturbed to the said Barolongs, shall continue in force. ARTICLE 3. If a British officer is appointed to reside at Pretoria or elsewhere within the South African Republic to discharge functions analogous to those of a Consular officer he will receive the protection and assistance of the Republic. ARTICLE 4. The South African Republic will conclude no treaty or engagement with any State or nation other than the Orange Free State, nor with any native tribe to the eastward or westward of the Republic, until the same has been approved by her Majesty the Queen. Such approval shall be considered to have been granted if her Majesty's Government shall not, within six months after receiving a copy of such treaty (which shall be delivered to them immediately upon its completion), have notified that the conclusion of such treaty is in conflict with the interests of Great Britain or of any of her Majesty's possessions in South Africa. ARTICLE 5. The South African Republic will be liable for any balance which may still remain due of the debts for which it was liable at the date of Annexation, to wit, the Cape Commercial Bank Loan, the Railway Loan, and the Orphan Chamber Debt, which debts will be a first charge upon the revenues of the Republic. The South African Republic will moreover be liable to her Majesty's Government for L250,000, which will be a second charge upon the revenues of the Republic. ARTICLE 6. The debt due as aforesaid by the South African Republic to her Majesty's Government will bear interest at the rate of three and a half per cent. from the date of the ratification of this Convention, and shall be repayable by a payment for interest and Sinking Fund of six pounds and ninepence per L100 per annum, which will extinguish the debt in twenty-five years. The said payment or six pounds and ninepence per L100 shall be payable half-yearly, in British currency, at the close of each half year from the date of such ratification: Provided always that the South African Republic shall be at liberty at the close of any half year to pay off the whole or any portion of the outstanding debt.