Drawing, 'Simia satyrus' by [Heinrich Tiedemann] Plate 35, figure 1 showing an anatomical study of the upper surface of the brain of an orang [Simia satyrus; orangutan]. An outline draft of the same figure is visible verso. Inscribed with title, publication, and plate details. Not signed. Subject: Eugenics / Anatomy Published in Philosophical Transactions as part of paper titled 'On the brain of the negro [sic], compared with that of the European and the orang-outang' by Friedrich Tiedemann. Received and read to the Royal Society on 9 June 1836. [1836]