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ART. XXVIII.--On the Color Relations of Atoms, Ions and Molecules;: Criteria of Color. CLASSIFICATION. PERIODIC LAW OF COLOR LAW OF COLOR COMPRISING ALL THE ELEMENTS IN NUMERICAL ORDER ALL THE ELEMENTS IN NUMERICAL ORDER Elementary Ions. THE LAW OF COLOR. Periodic Systems. First Division. Ions all Colorless. Transitional Elements. Second Division. Ions all colored. A PERIODIC LAW 0F COLOR.