Without attempting to answer these questions in this place, I will conclude by pointing out two facts, which seem to me of considerable importance. The first is that many nervous and mentally abnormal patients may be mediums were the pains taken to ascertain that fact. I know of one famous alienist who confided to me his belief that a very large percentage of mediumistic cases could be found in hospitals for hysterical patients or in wards for the mentally unbalanced. The trouble is that experiments tending to ascertain the truth of such a theory are never tried. Had not Dr. Ochorowicz been interested in things psychic, Mlle. Tomczyk would simply have been cured by him in the general routine manner and dismissed. The world would thus have been deprived of one of the most remarkable mediums on record! In the second place, these fluidic hands are almost identical in many ways with those presented by Eusapia Palladino at her best. The materialized hands, of varying degrees of density and formation, attached to long, shadowy arms, are exactly like the hands so often materialized at her seances--hands which are at times small, and at other times enormous. They no more resembled the hands of the medium than chalk resembles cheese. 16. This brings me to a final reflection, which I should like to mention before leaving this branch of our discussion. It concerns the question of darkness and its effect upon genuine mediumistic phenomena. Whether this effect be primarily physical, physiological, or psychological, the _fact_ remains that it exists; and the researches of Dr. Ochorowicz have tended to confirm this very strongly. His work has shown us (or rather confirmed us more strongly in the belief) that the question of _light_ is a highly important one, and that the greater the degree of darkness, _ceteris paribus_, the better and the more startling the phenomena. Now, there has always existed a sort of _a priori_ assumption that this should be so. Light, as we know, does bring about chemical reactions, and even exerts a definite physical force or pressure. Even so gross and so powerful a form of physical energy as wireless telegraphy is greatly interfered with by reason of the sun's rays (ultra-violet rays), and, of course, photographic plates are at once rendered useless by an instant's exposure to the sun. Again, it is known that sunlight has a more or less destructive influence upon all forms of animal and vegetable protoplasm, and it is very soon fatal to many of the lower forms of life. This being so, it has always appeared to me perfectly reasonable to suppose that the energy of the light-rays should interfere most seriously with the delicate and subtle forces and forms of energy which are liberated in the seance room. The old objection: "Why must these things always be done in the dark?" has appeared to me very short-sighted and inconsistent with all the facts above mentioned.