An Act for altering and amending an Act made in the Fifty-fifth Year of His present Majesty, to amend an Act made in the Forty-eighth Year of His present Majesty, to improve the Land Revenue of the Crown, so far as relates to the Great Forest of Brecknock, in the County of Brecknock; and for vesting in His Majesty certain Parts of the said Forest, and for inclosing the said Forest.