Quotes from Karl von Eckartshausen's books, and about them
Dead Souls on A Key to the Mysteries of Nature: “For his part, the Postmaster went in more for philosophy, and diligently perused such works as Young's Night Thoughts, and Eckharthausen's A Key to the Mysteries of Nature; of which latter work he would make copious extracts, though no one had the slightest notion what they referred to.”