Spirits - airy, volatile 'subtle bodies' - occupied a central place in early modern European culture. At the edge of the visible and perceptible, spiritus could signify a broad variety of subtle substances, both natural and divine: the vapours moving inside the body, the elements of air and fire, angels, demons and spectres, the Holy Spirit and the human soul. Spirits functioned as intermediaries between two opposite worlds with continually shifting borders. This book investigates specific meanings and uses of spiritus in a variety of early modern disciplines and fields - physiology, psychology, alchemy, theology, demonology, art theory, music theory, novels and the literature on love - thus revisiting the ambivalent history of a central ancient concept in a period of crisis and change. Contributors include: Wietse de Boer, Sven Dupre, Jennifer Frangos, Axel Christoph Gampp, Christine Gottler, Berthold Hub, Dawn Morgan, Wolfgang Neuber, Bret Rothstein, Rose Marie San Juan, Wilhelm Schmidt-Biggemann, Justin E. H. Smith, Paul J. Smith, Thijs Weststeijn, and Sarah F. Williams.