The aim of the present investigation was primarily the determination of the botanical source of dextrotubocurarine chloride on account of the use of the latter as an adjunct in anaesthesia. A bush-rope from northern Peru has now given dextrotubocurarine chloride and four non-quaternary bases of which dextrotomentocurine is new. A commercial curare from southern Peru also prepared from Ch. tomentosum has likewise given dextrotubocurarine chloride and four non-quaternary alkaloids. These results are in conflict with the results obtained in Part VI where Ch. tomentosum from northern Peru gave lævotubocurarine chloride. A botanically undifferentiated species may be involved. Anomospermum grandifolium which has a reputation as a constituent of curare has been examined. It contained a quaternary fraction with a curare-action.