Diagram illustrating Cartesian Principles
According to Descartes, the pineal gland (shown here behind the eyes) transmitted messages from the eyes to the muscles mechanically, but also linked humans to the one non-material part of the universe, the mind.

Photo Credit: The Warder Collection, NY

ResourceResearchReference

RESOURCE: Ralph's World Civilizations, Chapter 24
http://www.wwnorton.com/colleges/history/ralph/resource/24descar.htm
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