This, for me, extraordinary incident astonished me greatly, and since then I have always carefully examined my sensations. This examination has the fault of being purely subjective, but certain objective realities have confirmed it. A special sensation accompanies the emission of this nervous force, and with custom the passage of the energy expended in a seance can be felt, just as the interruption of its flow can be discerned. I have questioned several experimenters about this, and their observations have often corroborated mine. Therefore I think I may say that some kind of force is emitted by the sitters, which is elaborated by the medium; that the latter restores his losses at the expense of the experimenters, that certain people more readily than others furnish the medium with the force he requires; and that a certain sympathy of ideas, views, and sentiments between the experimenters is favourable to the emission of this force. I have no decided opinion upon the nature and origin of this force. I think it is kindred to the energy which circulates in our nerves, and which provokes the contraction of our muscles. Further on I shall give the reasons which lead me to think so. A second recommendation, no less important than the first, in my opinion, is to treat seriously, and note carefully all communications given through the table, through automatic writing or raps. I now arrive at the examination of one of the most curious facts which so-called ‘psychical’ experiences reveal. _To a certain extent_ the manifesting force appears to be intelligent. Nothing permits me to affirm or even to think, that the manifestations are due to an entity distinct from that of the sitters. It is not my province to discuss hypotheses: I confine myself to the relation of facts, and in the course of my recital, I will point out in detail the circumstances, which permit me to signalise the apparent individuality of the manifesting force. As in such matters I have always thought it better to preserve an expectant attitude, I have always been careful never to slight the communications received through the phenomena. I have imposed on myself the habit of treating these manifestations in the manner desired by them. Every time I acted otherwise, the results were indifferent.