I had another glass jar containing Caapi, an intoxicating drink used by the Uaupé Indians in their festas; but after I had kept it five months, and thought it quite safe, the Caapi fermented and burst the jar. I can therefore send only the articles from which it is prepared, viz. portions of the stems of a twining Mallpighiacea (seemingly an undescribed Banisteria), and of the roots of an Apocyneous twiner (Haemadictyon). The extraordinary eifects produced on the Indians by drinking Caapi I have myself witnessed, and I have detailed them to Mr. Bentham in some notes on the plants collected.