THE CHEMISTRY OF VITAMIN E. XXVI.1 5-HYDROXY-4,6,7-TRIMETHYLCOUMARAN, 5-HYDROXY-2, 2, 4, 6, 7-PENTAMETHYLCOUMARAN, 6-HYDROXY-2,2,5-TRIMETHYL-7,8-BENZOCHROMAN, AND 5-HYDROXY-2,4-DIMETHYL-6,7-BENZOCOUMARON.