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The philosophicall touch-stone, or observations upon Sir Kenelm Digbie's Discourses of the nature of bodies, and of the reasonable soule. In which his erroneous paradoxes are refuted, the truth, and Aristotelian philosophy vindicated, the immortality of mans soule briefly, but sufficiently proved. And the weak fortifications of a late Amsterdam ingeneer, patronizing the soules mortality, briefly slighted. / By Alexander Ross. Public Domain Mark. Source: Wellcome Collection.