Results The highest freezing point obtained for recrystallized phenothiazine was 184.21 f 0.02 O. This freezing p $ nt was obtained after three recrystallizations from toluene and butanol. These experiments were replicated four times. One sample of sublimed material followed by two recrystallizations from toluene gave a freezing point of 184. i'. In seven replications the freezing point determined in our apparatus of sublimed phenothiazine ...