11c. 1.>, icltl (,<: $(,).'l'hc lizatioii iii Iiolp1) licis-Iihoric acid iiia>-coiistitut better general method tliaii that recorded in the literature. 6 The hot rcactiori melt is poured into cold water and the red i) hosphate salt of I1 precipitates. The acid salt is collected by filtration and treated with excess base; the free dianiinoacridirie base obtained is of excel-
