Amendment of Excise Law: Fourth Schedule modifies Additional Duties of Excise Act, changing indirect tax provisions. Amendment of the Additional Duties of Excise (Goods of Special Importance) Act, 1957 is effected by the Finance (No. 2) Act, 1977 through specified changes in the Fourth Schedule, altering excise-related statutory provisions governing additional duties on certain goods and modifying the statutory scheme for indirect taxation.