When the patient, F. E—, handed me the MSS. entitled “Hallucinations and Sanity,” I recalled a paper read to this Association some ten years ago by the late Dr. Hunter Steen—a paper which Sir George Savage at the time styled as “mosetncyclopædic” (vide Journ. Ment. Sci., 1917, pp. 328 and 437). In the course of a most instructive discussion following on it, some points were raised which are especially noteworthy.