A gravimetric method of microdetermination of copper with anthranilic acid has been established, the cristalline copper anthranilate salt being used, according to the three microchemical classical technics. Let us note that in thePregl procedure it is advisable to neutralise the reagentafter the precipitation. The quantity of copper never should exceed 2 mg., this is probably due to the sensibility of the reaction. Further, an optimum reagent excess of 30% must be used in all cases. When a too large excess is present, it is difficult to eliminate it from the precipitate. Dilution should be greater than with any other cations, this is an important factor on which the authors insist, as did the authors who studied the macromethod. The influence of other salts being present in the solution will be given in a next paper. Zinc, cobalt, nickel, cadmium, lead, mercury(II) react with anthranilic acid in the same way as copper, producing insoluble salts. If two or more of these cations are present in the solution, a preliminary separation should be effected. As too high results were obtained (1 up to 2,5%) in a few cases, the authors tried to treat the dried precipitate which had been weighed and squashed with alcohol or ether on a water bath during 10 to 20 minutes, hoping to eliminate the eventual excess of adsorbed reagent in the precipitate. This failed to lead to success and the idea of dissolving the excess of anthranilic acid in solvents after weighing the precipitate was abandoned.