Two treatises: The nature of Bodies and The nature of Man's Soul

Two treatises in the one of which the nature of bodies, in the other, the nature of mans soule is looked into in way of discovery of the immortality of reasonable soules.
Kenelm Digby was a Catholic virtuoso, a Royalist and a natural philosopher. He met Descartes in Holland and introduced the philosopher Thomas Hobbes to Descartes' writings. Digby was an early member of the Royal Society and was famous for his alchemical recipes and the weapon salve (a salve applied to the weapon rather than the injury!). This book, the Two Treatises, is his most important. It presents a mechanistic account of the nature and motion of bodies, dealing with such issues as refraction and the movement of the heart. Digby's unique and eclectic natural philosophy has Aristotelian elements as well as showing the strong influence of Descartes.