"He gives a curious system of the instrument of Memory, which he says is the last or inner ventricle of the brain, whereas the first or outer ventricles are the instruments of perception or thought. He affirms that, according as you hurt one or other of thole instruments, you destroy either of the faculties, and he gives a very entertaining experimental account of instances in confirmation of his theory."
— Boswell, James (1740-1795)
(p. 156 in London Magazine)
See also James Boswell, The Hypochondriack, ed. Margery Bailey, 2 vols. (Stanford UP, 1928).