The human body is like a barometer: "If the external air can affect the motions of so heavy a substance as mercury, in the tube of the barometer; we need no wonder, that it should affect those finer fluids, that circulate through the human body."
Of Dreaming [from Dissertations Moral and Critical]
Beattie, James. <u>Dissertations Moral and Critical</u>. Printed for Strahan, Cadell, and Creech: London, 1783. Facsimile-Reprint: Friedrich Frommann Verlag, Stuttgart-Bad Cannstatt, 1970.