Were they genuine, these phenomena? I am not sure, but I cannot help wondering how they could have been simulated! There are some distinctions to be made between these appearances, of which I have only described the principal. The luminous hand, which unhooked the bell, was well defined: it was very distinct and one mass of light. I quite understand that suspicion might fall on the medium; he might have covered his own hand with some phosphorescent substance, and, thanks to his height, unhooked the bell himself. Let us try to find out what substance he could have used. We must, I think, put aside the idea of phosphorescent oil. This would have left traces on the medium’s hands and clothes, on the curtains of the cabinet, on the bell, on the wall where the bell was hung. Now there was nothing of the sort. The medium’s hands and garments bore no trace whatsoever of oil. Besides, the light which is given forth by preparations which have phosphorus as their basis, has neither the duration, nor the uniformity of the lights I observed.

Is it a preparation with a basis of sulphides of the calcium class? Sulphides, in order to be phosphorescent, ought to be in a dry state. They are usually reduced to a powder, and this powder is pasted on to the substance we wish to render luminous. The appearance of a hand might be given by a glove done over with sulphide of strontium or calcium. But I need not say how difficult it would be to put on this glove. True, the glove could be stuffed with horsehair, dipped in paste and sprinkled over with sulphide in the desired position. The phenomenon which I observed, could then be explained in the following manner: The medium might have moved the luminous glove about with one hand, and unhooked the bell with the other. This is possible, and yet it does not appear to me to explain what I saw.

In any case, this explanation ceases to be satisfactory, when we consider the case of the floating lights. I know of no system which allows of imitating the immaterial, fugitive, diaphanous appearance of these curious lights. My chemical knowledge, it is true, is very rudimentary; and one of the young men I speak of is a clever chemist; it may be he knows of a more perfect process than those just mentioned. Nevertheless, it seems to me that a piece of cloth done over with some luminous preparation or other, would not have the aspect of the light which I saw floating about the room. I think it is very difficult to reproduce these vague, ill-defined lights, which are more like a luminous cloud than a phosphorescent material object.

The outlines of the last appearance I described were well defined, and in its upper part reminded one of the folds of material. Some of my co-experimenters thought they recognised a masculine, bearded head therein, covered with a turban or burnoose. If we had been in the presence of an artificial phenomenon, the luminous object should have presented the same aspect to every observer. It was not so in reality; for some of us could distinguish no recognisable form in the luminosity. I know that the imagination can be the cause of much visual illusion. It makes us complete imperfect images, and see faces and forms in plays of light and shade which only faintly recall these forms and faces. I have not observed the curious phenomena which I describe, under conditions sufficiently precise to enable me to affirm their objectivity, and I can only repeat what I said just now, that their reality appeared probable to me, in spite of the frauds of which I knew, and those which I suspected; in spite of my intellect’s prejudice, I was favourably impressed.

I will add that the luminosity, which floated about the room, moved about up and down, and lasted for several seconds. That part of the room where it floated about was blocked up with the table, chairs and other furniture, which had been taken there from the recess adjoining the seance-room. All the experimenters were grouped together in one part of the room. None of them left their seats during the production of these phenomena. Had the medium left the cabinet and manœuvred the light we perceived, he would have knocked against the scattered furniture. We kept the strictest silence, when luminous phenomena were being produced, and we would certainly have heard the medium moving about, had he left the cabinet. Now, we heard no noise whatsoever; neither of the footsteps he would have been obliged to make, nor of the furniture which he would have knocked against, unless he be able to see remarkably well in the dark.

Such are the observations I have to present upon this curious seance. One of my friends, an eminent savant, well acquainted with this kind of phenomena, had, like myself, the impression that those I have depicted were real.

Moreover, in other seances this medium gave us similar luminosities. I will even point out that one of the suspected sitters—the medical student—the clever chemist—having been eliminated, and the experiments taking place at the house of one of my medical friends, we observed globular lights on the curtains of the cabinet behind which the medium was sitting. These lights were much smaller than those I have just described—they were as large as a walnut—but were easily observable.

I hope to be able to resume my experiments with this medium; for to me he seems to be one of the most powerful I have ever seen. It is really a pity he should have fallen into the hands of imprudent and ignorant young men; they have abused his force, worn him out, and made him ill. Judiciously handled, he might have become extraordinary. It remains to be seen, if the bad conditions under which he has been developed have not had the effect of destroying the rare faculty he possessed. I will return to these considerations later on.

The lights produced by this young man were the most brilliant I have ever seen. Their colour has been well compared to the light of the nebula by one of my co-experimenters, a distinguished amateur astronomer. This experimenter had a good spectroscope, but he has never been able to succeed in analysing, spectroscopically, the lights we have seen. They were too unsteady and fugitive.