2. Take now a specimen of another group of cases. The medium places one of her hands upon that of some person, and with the other beats the air, with one, two, three, or four strokes or raps. The raps are heard in the table, and you feel the vibrations at the same time that you hear them,--sharp blows which make you think of electric shocks. It is superfluous to state that the feet of the medium do not touch those of the table, but are kept at a distance from them. The medium next places her hands with ours upon the table, and the taps heard in the table are stronger than in the preceding case. [Illustration: PLATE I. COMPLETE LEVITATION OF A TABLE IN PROFESSOR FLAMMARION'S SALON THROUGH MEDIUMSHIP OF EUSAPIA PALADINO.] These taps audible in the table, this "typtology" well known to Spiritualists, have been frequently attributed to some kind of trickery or another, to a cracking muscle or to various actions of the medium. After the comparative study I have made of these special occurrences I believe I am right in affirming that this fact also is not less certain than the first. Rappings, as is well known, are obtained in all kinds of rhythms, and responses to all questions are obtained through simple conventions, by which it is agreed, for instance, that three taps shall mean "yes" and two mean "no," and that, while the letters of the alphabet are being read, words can be dictated by taps made as each letter is named. 3. During our experiments, while we four persons are seated around a table asking for a communication which does not arrive, an arm-chair, placed about twenty-four inches from the medium's foot (upon which I have placed my foot to make sure that she cannot use hers),--an arm-chair, I say, begins to move, and comes sliding up to us. I push it back; it returns. It is a stuffed affair (_pouf_), very heavy, but easily capable of gliding over the floor. This thing happened on the 29th of last March, and again on April 5th. It could have been done by drawing the chair with a string or by the medium putting her foot sufficiently far out. But it happened over and over again (five or six times), automatically moving, and that so violently that the chair jumped about the floor in a topsy-turvy fashion and ended by falling bottom side up without anybody having touched it. 4. Here is a fourth case re-observed this year, after having been several times verified by me, notably in 1898. Curtains near the medium, but which it is impossible for her to touch, either with the hand or the foot, swell out their whole length, as if inflated by a gusty wind. I have several times seen them envelop the heads of the spectators as if with cowls of Capuchin monks. 5. Here is a fifth instance, authenticated by me several times, and always with the same care.