Note 12 — Chapter III · THE SENSES, AS THE INLETS TO KNOWLEDGE—SIGHT AND HEARING.
Reading edition
See "An Essay towards a Theory of Apparitions," by John Ferriar, M.D., 1813; and "Sketches of the Philosophy of Apparitions; or, An Attempt to trace such Illusions to their Physical Causes," by Samuel Hibbert, M.D., 1824.