I have already said that the personification is generally very open to suggestion. We must remember that this is a special kind of suggestibility. In hypnotism a commanding tone of voice gives greater force to the suggestion; it is not the same with the personification in question, which shows itself rebellious to all imperative orders. On the contrary, it readily yields to suggestions made with gentleness and persistence. As a rule, I give the object I have in view, and my reasons for setting aside all phenomena which can be explained by unconscious muscular action. I repeat, I treat the personification as a co-experimenter. It is seldom that, thus exhorted, it does not willingly consent to abstain from phenomena devoid of interest, and promise more demonstrative ones. I have already said too much faith must not be put in such promises; at least nine out of ten experiments will come to nothing, and will have to be worked out again on fresh lines. But the experimenter’s patience will not always be tried in vain. Sooner or later he will meet with the indispensable medium; and his observations will then be similar to mine. The first supernormal phenomena are raps and oscillations without contact. Sometimes the phenomenon, from the very outset, will manifest itself with intensity; this is the exception; generally the noises and movements, feeble in the beginning, will grow in intensity. As soon as raps without contact have been obtained, certain signals must be agreed upon. The simplest way, then, is to adopt the typtological code of signals, _i.e._ two raps for ‘no,’ three for ‘yes,’ five for the alphabet. The phenomena then become very interesting, for when the raps are given without contact, the hypothesis of involuntary movements becomes insufficient to explain them. I have recently received very intelligent communications in this way. We must not grow tired of having the words repeated. It often happens that letters are left out, or that one letter is given instead of another. This happens particularly with neighbouring letters. In carefully noting down the letters a very clear sense will often be found. For example, the raps will give MARTJN for Martin, HEORIETTE for Henriette, etc. We must not give up as soon as the word seems to become unintelligible. Wait until the sentence is finished, when it will sometimes suddenly clear itself. It sometimes happens that the letters are dictated backwards. When the sentence is incomprehensible, we must begin all over again. Even in experiments whose aim is to obtain material phenomena, we must not refuse to listen to demands for the alphabet, for the personification will then often advise on the manner of operating.