16. All expenses incurred by the Collector in erecting temporary or permanent boundary-marks under this Act, shall, in manner hereinafter provided, be apportioned among, and levied from, the zamindars and tenure-holders on their estates: Provided that no tenure-holder shall be liable to pay any portion of the expenses incurred by the erection of boundary-marks on an estate, unless some portion of his tenure is situated within fifteen hundred feet of some such boundary-mark.