We must not, however, place the medium under such conditions that the experiment cannot be realised. We do not understand these conditions, and, perhaps, apparently simple phenomena may not be realisable. I remember that at Choisy in 1896, a lady, a member of my family—she has an insurmountable bias against psychical experiments, which she declares _a priori_ are fraudulent—declared to Eusapia that she would believe in her phenomena, if she could make a doll’s table move before her eyes. Eusapia placed this small table on top of the seance-table, but did not succeed in making it move. Why could not such an apparently simple phenomenon be obtained? We must, therefore, observe, but we must not wish to impose beforehand the conditions which the phenomenon should fulfil in order to be accepted. Many experimenters tie up the medium, put him into a sack, and seal him therein. If he consents to this, well and good; if he refuses, other means of control must be found. We must not indeed suppose that the medium’s refusal is always due to a desire to fraud. The slightest fetters may sometimes be very painful, especially when there be cutaneous hyperæsthesia. Before bringing a negative judgment to bear upon the phenomena, the experimenters should always hold a certain number of seances, and should not found their judgment upon one bad seance alone; by so doing they would expose themselves to a wrong course of action. It is especially in psychical experimentation that inexhaustible patience is necessary. CONCLUSION And now my task is accomplished. I perceive that in the latter part of my work, I have broached complex and difficult problems, and have allowed myself to be drawn into—not theorising—but combating certain theories which appear to me to be incorrect or insufficient; for which I beg my reader’s pardon. In conclusion, I wish to repeat that I am convinced of having, in a sure, positive manner, observed raps and movements without contact. I have seen many other phenomena; but I will not venture to be so affirmative concerning them, at present. I make no pretension of demonstrating the reality of the facts I have observed. In publishing my conclusions, I have had but one object in view, that of bringing my testimony to those, who, long before me, attested to the facts which I in my turn affirm. Does that mean that I have not been mistaken? most assuredly, no! And it is very possible that my observations may have been imperfect. I am, nevertheless, so convinced of their exactness, that I can only advise those who may impugn the accuracy of my statements, to experiment as I have done, with the same method, and the same patience. I have had many occasions to pronounce these words in the course of my work, and now in terminating it, I pronounce them once again with stronger emphasis than ever.