Engraving by Poisson after a painting by Pierre Sonnerat (1748-1814), showing men using oxen to press oil from some sort of plant product. Illustration from Sonnerat's 'Voyage aux Indes Orientales et a la Chine, fait par ordre du roi, depuis 1774 jusqu'en 1781' ('Voyage to the East Indies and China, made by order of the king, from 1774 to 1781'), published in 1782.