An Act for repealing the Duty on the Materials used in making Flint and Phial Glass; and for granting, until the First Day of August One thousand eight hundred and twelve, other Duties in lieu thereof; and for continuing and amending an Act passed in the Forty ninth Year of His Majesty's Reign, intituled, An Act for repealing the Duties on the Materials used in making Spread Window Glass and Crown Glass, and for granting other Duties in lieu thereof; and for the better Collection of the said Duties.