228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm. by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms.per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting228 ABSTRACTS OF CHEMICAL PAPERS malic and tartaric acids may be found with an accuracy of +0.003 grm.by referenee to the accompanying graph, in which the curves slanting down from left to right represent the readings for the acids ‘( activated ” by uranyl acetate and the upward curves from left to right the readings with ammonium molybdate. The point of intersection of the readings indicates on the abscissz the tartaric acid, and OD the ordinates the malic acid in grms. per 100 C.C. Citric acid is probably the only acid which interferes with the results. In the case of highly coloured liquids it is necessary to decolourise the liquid with bromine, and to ueutralise the resulting