An Act to continue until the Thirty-first Day of August One thousand eight hundred and forty-eight, and to the End of the next Session of Parliament, and to amend, an Act of the Fifth and Sixth Years of Her present Majesty, for permitting Wheat to be delivered from the Warehouse or the Vessel Duty-free, upon the previous Substitution of an equivalent Quantity of Flour or Biscuit in the Warehouse.