2. When the ancient form of the work is changed, either by an addition being made to it, or by some part of the ancient work being taken away, it is styled also a new work. Civ. Code of Lo. 852; Puff. b. 8 , c. 5, SS 3; Nov. Rec. L. 1, tit. 32; Asso y Manuel, b. 2, tit. 6, p. 144.