DIGBY, Sir Kenelm (1603-1665). 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. Paris: Gilles Blaizot, 1644.

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DIGBY, Sir Kenelm (1603-1665). 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. Paris: Gilles Blaizot, 1644.

2o (416 x 280 mm). (Title-page lightly soiled and with lower fore-corner frayed, some minor marginal worming at end, some leaves lightly browned, internal tear on two fore-margins.) Contemporary English calf (rebacked, corners repaired). Provenance: Constantia Dupplin (early signature on front flyleaf).

FIRST EDITION OF DIGBY'S INTRODUCTION OF GASSENDIAN AND CARTESIAN ATOMISM INTO ENGLAND. In this work Digby intended to prove the immortality of the rational soul and its distinction from the material body. The first treatise, The Nature of Bodies, contains the first fully developed atomistic system of the seventeeth century and introduced Gassendian and Cartesian atomism into England--providing Boyle and Newton with the foundation for their great achievements in chemistry and physics. Digby's first treatise also contains the first important defense in English of Harvey's theory of the circulation. A VERY LARGE COPY. Duveen, pp. 171-72; NLM/Krivatsy 3256; Thorndike VII, pp. 498-502; Wing D-1448; Norman 639.