The Dynamic Pineal Gland in Text and Paratext: Florentius Schuyl and the Corporeal–Spiritual Connection of the Brain and Soul in the Latin Editions (1662, 1664) of René Descartes’ <i>Treatise on Man</i>

Abstract

The Latin (De Homine, 1662, 1664) and French (L’Homme, 1664) editions of René Descartes’ Treatise on Man present different iconographic traditions, but the iconography of the Latin editions is little known. Dutch physician and botanist Florentius Schuyl edited De Homine and illustrated it himself with a mix of woodcut and copperplate illustrations. This paper examines Schuyl’s innovative depictions of purported dynamic aspects of the pineal gland as claimed by Descartes: (1) repeatedly illustrating the pineal gland as the corporeal–spiritual linkage of the brain and soul; and (2) using a movable flap anatomy to illustrate the pineal gland as a motile structure that both responds to and directs animal spirits. None of the canonical illustrations in the later French edition attempted to depict the corporeal–spiritual linkage of the brain and soul, and the modest attempts in the French edition to depict the motility of the pineal gland relied simply on superimposition of two purported positions of the gland, a technique also employed by Schuyl. This paper also reviews how Schuyl’s illustration of a corporeal–spiritual linkage of the brain and soul in a goat sharply contrasts with his written defense of Descartes’ bête-machine doctrine in the extended preface to De Homine.

Keywords

• history—17th century
• Descartes
• Schuyl
• pineal gland
• rational soul
• animal spirits