Paper, 'Some remarks on the physiological action of the Tanghinia venenifera' by A [Albert von] Kölliker and E Pelikan Kölliker and Pelikan describe the Tanghinia venenifera, 'the famous poison-tree of Madagascar', writing on its history, the extraction of its poison and the physiological effects of its poison, using frogs as test subjects. They observe that it is a paralysing poison which stops the action of the heart within five to 15 minutes. Subject: Botany / Toxicology Received 1 March 1858. Communicated by [Benjamin Collins] Brodie. A version of this paper was published in volume 9 of the Proceedings of the Royal Society as 'Some remarks on the physiological action of the Tanghinia venenifera'. 1858