 During the course of the twentieth century, the main interest in Molyneux’s problem has been historical. Biographers and commentators dealing with well-known philosophers have analysed the solutions they proposed for it. Molyneux’s problem has also turned up frequently in textbooks and general histories of psychology, ophthalmology, neurophysiology, etcetera (and also in publications on diverse disciplines, like mathematics, architecture, literature, arts and sports). A few authors have written brief and incomplete histories of the problem. Degenaar (1996) has written a comprehensive survey of the history of the discussion about Molyneux’s problem. Riskin (2002) described Molyneux’s problem in the wider context of the Enlightenment.