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1 From the Department of Pharmacology, The George Washington University, School of Medicine, Washington, D. C., and the Department of Pharmacology, University of California, School of Medicine, San Francisco, Calif.
1. The toxicity of p-sulfonamidophenylarsonic acid, its derivatives, and of propamidine are reported.
2. The tolerated dose of p-sulfonamidophenylarsonic acid in mice was found to be 1900 mgm./kgm. and the curative dose 700 mgm./kgm.
3. Propamidine was found to be tolerated at 40 mgm./kgm. and curative at 5 mgm./kgm.
4. None of the N substituted derivatives of p-sulfonamidophenylarsonic acid showed trypanocidal activity.
5. A discussion of the biochemorphology of the compounds is included.
Submitted on May 4, 1944