"He conjectured, that the soul is seated in a small gland in the brain, called the pineal gland: That there, as in her chamber of presence, she receives intelligence of every thing that affects the senses, by means of a subtile fluid contained in the nerves, called the animal spirits; and that she dispatches these animal spirits, as her messengers, to put in motion the several muscles of the body, as there is occasion."
Essays on the Intellectual Powers of Man
4 entries in ESTC (1785, 1786, 1790, 1793).<br>
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See Thomas Reid, <u>Essays on the Intellectual Powers of Man</u> (Edinburgh and London: Printed for John Bell, and G.G.J. & J. Robinson, 1785). &lt;<a href="http://books.google.com/books?id=2A4cAQAAMAAJ">Link to Google Books</a>&gt;