Summary The araban of Salkowski has been shown not to be a simple polymer of arabinose but to contain arabinose, galactose, rhamnose and glucuronic acid in about the same proportion as they are present in ash-free gum arabic. PITTSBURGH, PENNSYLVANIA ... [CONTRIBUTION FROM THE DEPARTMENT OF CHEMISTRY, YALE UNIVERSITY J ... RESEARCHES ON PYRIMIDINES. CXVIII. MOLECULAR REARRANGEMENTS IN THE THYMINE SERIES ...