In sitting for materialization, the circle should maintain the same general demeanor that it observes at other times. Silence or dignified conversation may be indulged in, but joking or levity should be forbidden. Hands should be held, and reverent singing indulged in. It should be remembered that this phase of mediumistic phenomena is not something apart and distinct from the lesser phases which have been described in detail in this book. On the contrary, it is simply a matter of degree, and the same general principles underlie all phases of mediumistic phenomena. Therefore, it is not necessary to repeat the instructions regarding the conduct of the circle, or the rules for the development of the medium. Read the earlier chapters for the same, which are equally applicable in this place as in the places in which they originally appeared. Trumpet Mediumship. In what is known as "trumpet mediumship," the sound of the voice of the communicating spirit is increased in power by the use of a trumpet shaped arrangement of paper, card-board, tin, or aluminum. There is no particular virtue in the material used, and anyone may make a serviceable trumpet out of heavy paper or thin card-board. The principle of the use of the "spirit trumpet" is precisely that of the well-known megaphone, i.e., it MAGNIFIES the sound, and increases its carrying power. A spirit speaking in the faintest whisper through the trumpet is enabled to have its voice heard plainly by those present in the circle, where otherwise nothing would be heard. Often the spirit force is so strong that it will pick up the trumpet and carry it around the circle, tapping the various members thereof, and whispering through it into the ear of some particular members. Weak spirits, therefore, who are unable to make themselves heard in the ordinary way, often employ the trumpet with effect in seances. When the trumpet is used, it should be placed on the table, awaiting the use of the spirits. Spirit Playing on Musical Instruments, Etc. The spirit forces also sometimes will see fit to play upon musical instruments placed in the cabinet with the medium, the guitar, mandolin, concertina, accordion, etc., being the instruments preferred in such cases. Of course the sceptics will claim that the medium may play the instruments himself or herself, and thus give ground for the claim of fraud; consequently in the case of public seances, and many private ones as well, the medium will insist upon having his or her hands tied, and other precautions taken to eliminate the possibility of fraud and deception. Such precautions are in no way a reflection upon the medium, and are, in fact, demanded by many mediums as a matter of self-respect, self-protection, and the cause of truth. In many cases in which the mediums were entirely lacking in musical education, knowledge, or training, the spirits have performed skilled selections of music upon the instruments in the cabinet. Independent Slate Writing.