Evaluation of lime Methods for Determining Morphine in Opium**The subject matter of this paper was submitted privately to H. J. Anslinger, United States Commissioncr of Narcotics, and members of the Commission of Experts of the League of Nations engaged in standardizing opium assay methods, in two progress reports dated April 2 and June 25, 1935. Acknowledgment was made in the Quarterly Bulletin of the Hcalth Organization of the League of Nations, Vol. IV, Extract No. 16, page 816.