The phenomena of which I am speaking are so extraordinary that one is led to doubt them, even when one feels assured that he has seen them. Thus, for example, I noticed that M. Rene Baschet--my learned friend, present editor of _Illustration_--affirmed before us all, during the seance and afterward, that he saw with his own eyes, under the table, a head like that of a young girl of about twelve years of age, together with the bust. This head sank down vertically while he was looking at it and disappeared. He made the affirmation on the 21st, repeated it on the 22d at a theatre where we met, and on the 25th again at his home. Some time after, M. Baschet was convinced that he had been deceived, that he had been the dupe of an illusion. That is also possible. I was looking at the same time, as well as other persons, and we did not see anything. It is then very human, when we are thinking, some days later, of these curious things, for us to suspect ourselves. But there are prejudices less explicable. Thus, for example, at the seance of November 28 a distinguished engineer, M. L., absolutely refused to admit the levitation of the table, in spite of the evidence. Of this my readers may judge for themselves. Here is a note which I extract from my reports: M. L. tells me that the medium lifts the table _with her feet_, while resting her hands upon it. I ask Eusapia to draw back her feet under her chair. The table is lifted. After this second levitation, M. L. declares that he is not satisfied (although neither of the feet of the medium is under a foot of the table), and that we must begin the experiment again, without having _her legs_ touched at any point. The medium then proposes that her legs be fastened to those of M. L. A third levitation takes place, after the left leg (the incriminated one) of the medium has been bound to the left leg of M. L. This gentleman then declares that the hypotheses he has made, in order to explain the phenomenon, are null and void, but that there must be, all the same, a trick in the thing, because he does not believe in the supernatural. Neither do I believe in the supernatural. And yet there is no trick. This manner of reasoning, rather common, does not seem to me scientific. It is to claim that we know the limits of the possible and of the impossible. People who deny that the earth moves reason in just this way. That which is contrary to common sense is not impossible. Common sense is the average state of popular knowledge; that is to say, of general ignorance.