ago a young Australian came to this country with a reputation for "genuine thought-reading," based on the successful mystification of some members of a certain Colonial Legislature. The writer had a few experiments with this person, in which several small objects--a knife, a glass bottle, etc.--placed in the full light of a shaded lamp, were correctly named. The object was in each case placed behind the back of the "Thought-reader," who looked intently at the writer's eyes, which were in turn fixed upon the brightly illuminated object. Experiments made under more usual conditions, not dictated by the "Thought-reader," completely failed; and there can be little doubt that the initial successes were due to the "Thought-reader" seeing the image of the object reflected in the agent's cornea. (2) _Hyperæsthesia._--But, after all, it is rarely necessary to take special precautions against fraud, for there are dangers to be guarded against of a more subtle kind. There are various, and as yet imperfectly known methods of communication by which indications may be unconsciously given and as unconsciously received. Thus, to take the last instance, it is pretty certain that cornea-reading does not always imply fraud, and that hints may be gained in all good faith from any reflecting surface in the neighbourhood of the experimenter; or the movements of lips, larynx, and even hands and limbs may betray the secret to eye or ear. We know little of the limits of our sensory powers even in normal life; and we do know that in certain subconscious states--automatic, hypnotic, somnambulic--these limits may be greatly exceeded, and that indications so subtle as frequently to escape the vigilance of trained observers may be seized and interpreted by the hypnotic or automatic subject. It is clear, therefore, that results which it is possible to attribute to deliberate fraud stand almost necessarily self-condemned. For if the precautions taken by the investigators left such an explanation open, much more were those precautions insufficient to guard against the subtler modes of communication referred to. It is not the friend whom we know whose eyes must be closed and his ears muffled, but the "Mr. Hyde," whose lurking presence in each of us we are only now beginning to suspect.