And it is hereby enacted, that the party who shall be declared the purchaser of an estate at any such public sale as aforesaid, shall be required to deposit immediately, or as soon after the conclusion of the sale as the Collector may think necessary, either in Cash, Bank of Bengal Notes or Post Bills, or Government Securities duly indorsed, 25 per cent. on the amount of his bid and in default of such deposit, the estate shall, forthwith, be put up again and sold.