The phenomenon, which I have called ‘visibility of the digital effluvium’ for the sake of convenience, is very easy to observe. I make great reserves on its objectivity, although I think its reality is more probable than its non-existence. It is most desirable that competent experimenters should verify these observations, which I only present as uncertain. I would have no doubt whatever of the phenomenon, if the accounts of the persons with whom I experimented had always concorded as to the direction taken by the effluvia; but it was not so. Though there is a good proportion of corroboration, I have often observed contradictions in the descriptions which were given me. Although the digital effluvium does not yet appear to me to be demonstrated, I think it will be interesting to point out the analogies it presents with phenomena already mentioned by diverse experimenters, notably by Reichenbach and de Rochas. These two experimenters operated under very different conditions to mine. The one placed his sensitive in profound obscurity and left him there for a time; then he made him look at living beings, flowers, magnets, ends of cords, and metal wires, opposite ends of which were in the sun; his sensitives generally saw—especially with human hands, crystals, and magnetic poles—a kind of flame or luminous mist surrounding them, or issuing from them. Rochas has chiefly experimented with sensitives plunged in deep sleep; every one has read of his experiments,—the blue and red coloration which his sensitives gave to the gleams of light which are emitted by magnetic poles, and the right and left sides of the body. My conditions of experimentation were very different from those under which Reichenbach and Rochas worked. I took the first comer and operated in broad daylight. But my observations tend to confirm theirs, at least in what concerns the radiation of something at the finger-tips. Another interesting observation remains to be made. I have shown that very probably linen, and perhaps wood also, were easily impregnated with that substance of which the effluvium is constituted. This fact may be compared with those I pointed out, when dealing with telekinetic movements: particularly the approach of a small table which touched the cloth of the table at which I was breakfasting; the approach of the chair which was touched by a wooden newspaper-holder lying on the table; and lastly, the curious bulging out of mediums’ dresses, which grazed the feet of the table in some cases of telekinesis. Without forming any premature hypothesis, it is allowable to look upon the digital effluvium as having some connection with the force, which is the determining cause of movements without contact. The effluvium is visible under other conditions, which are worth noting. It can be seen, when passes are made over a person or an object. The appearance is again similar to smoke; it is a bluish-grey mist, which seems to form prolongations of the fingers.