QW Governor's allowance or disallowance noted thereon, will be returned to the Treasurer. If approved, it will be sufficient authority for the expenditure to be incurred, and one copy will be retained by the Treasurer. The other copy will be sent to the head of the department from which it was received for record and reference 266. Should the expenditure authorised upon any Requisition be found insufficient, the head of the department requiring authority for further expen- diture will, so soon as he foresees the necessity there- for, forward to the Treasurer a supplementary Requi- sition for such further expenditure, drawn up in the same form as the original Requisition and accom- panied by a memorandum explaining the necessity for the axeeas 267. In any exceptional case where it is manifestly for the benefit of the public service that expenditure should be immediately incurred, and time does not permit of authority being obtained in the usual way, an officer may, on his own responsibility, incur the expenditure ; but he will at once forward a Requisition as above provided with a covering memorandum ex- plaining the reasons which induced him to depart from the ordinary course. In every such case he will be held personally liable for the expenditure in the event of the payment not being finally approved; and any items which may appear unnecessary or extravagant will be disallowed and surcharged against him. 268. All payment entries in the accounts must be vouched for on the prescribed form. 269. Vouchers for all salaries, allowances, and othet services included in the General Warrant will be delivered duly certified by the heads of departments to the Treasurer, or, in the out-stations, to the nearest sub-accountant, three clear days at least before the