Silvia Parigi, Ph. D. in Philosophy and History of Science, is Professor in charge of History of Science at the University of Cassino. She is the author of Il Mondo visibile. George Berkeley e la "perspectiva" (1995), editor/translator of a wide Italian collection of Berkeley’s works, (1996) and co-editor of Studi sull’entusiasmo (2001). Her articles include studies on the history of theories of vision and perception from the Middle Ages to the eighteenth century, Giacomo Leopardi’s epistemology, ancient and modern views on oculus fascinans. Currently working on the modern history of the concepts of spirit and effluvium, she is also in the editorial board of Berkeley Studies.