THE bromination of 1-methylglyoxaline takes it similar coixrse to that of glyoxaline itself (Balaban and Pyman, J., 1922, 121, B47), 2: 4: 5-tribromo-1-mcthylglyoxaline being the main product of the reaction; a little 4:~-dibroi~~ ol-methylglyozuline(I) is formed, of which