An Act to revive, amend and continue, until the Twenty-fifth Day of March One thousand eight hundred and twenty-one, so much of an Act of the Forty-first Year of His present Majesty as allows the Use of Salt, Duty-free, for curing Fish in Bulk or in Barrels; and to repeal certain Laws relating to the Allowance of Salt, Duty-free, for the North Seas and Ireland Fisheries.