(To THE EDITOR OF THE "SPECTATOR-1 Szn,—I have no doubt of the truth of the theory that thought depends on currents in the nerves of the brain, but. I object to the expression that the brain secretes thought, as being barbarously inaccurate. You might as well say that the muscles secrete motion. What is secreted is a substance, as bile or saliva. Thought, like motion, is not a substance, but an action.—I am, Sir, &c.,
JOSE.PH JOHN MURPHY.
Old Forge, Dunmurry, county Antrim, November 14.