When it is not possible, according to the rule given in the preceding section, to determine which of the two united things is the principal one, the thing of the greater value shall be considered as such, and between two things of equal value, that having the greater volume.\nIn paintings and sculptures, in writings, printed matter, engravings and lithographs, the board, metal, stone, canvas, paper or parchment, shall be considered as accessory things.\nHistory —Civil Code, 1930, § 312.
Puerto Rico Legal Code