"The Soul resides eminently in the Brain, where all the Nervous Fibres terminate inwardly, like a Musician by a well-tuned Instrument, which has Keys within, on which it may play, and without, on which other Persons and Bodies may also play."
An Essay of Health and Long Life
Cheyne, George. <u>An Essay of Health and Long Life</u> (London: George Strahan, 1724). &lt;<a href="http://books.google.com/books?id=5wIAAAAAQAAJ">Link to Google Books</a>&gt;