In almost all instances of materialization phenomena in the record of modern spiritualism we find that a cabinet was employed. There are two main reasons advanced for the necessity of the cabinet in this phase of mediumistic phenomena. The first of said reasons is that in many cases darkness has been found necessary for the preliminary work of the materialization, although absolute darkness is not necessary in the general room in which the materialized spirit forms afterward appear. The second of the said reasons is that there seems to be a psychic atmosphere created by the blending of the spirit forces with those of the medium, which atmosphere must be kept apart from and unmixed with the auras of the members of the outside circle or the general visitors at the seance. Why the Cabinet Is Necessary. Just what is the technical reason for this necessity is a source of argument and dispute among the different authorities on the subject, and it may be said that the matter is not as yet definitely settled. But whatever may be such technical explanation, the fact remains that the seclusion of the medium has been found almost absolutely necessary for the production of the phenomena of spirit materialization. The few exceptions noted in the history of modern spiritualism only go to establish the general rule. For the purpose of a general study of the subject, it may be accepted as a general fact that the production of spirit materialization has as one of its necessary conditions the presence and use of a dark cabinet in which the medium is secluded from the circle or assemblage of persons attending the seance. How to Make the Spirit Cabinet. One of the best kind of cabinets for this purpose is a small alcove room, or other small room adjoining the room in which the visitors sit at the seance. A large closet will also answer the purpose very well, in fact many mediums prefer the closet to any other form of cabinet. If neither small room or closet is available, then it becomes necessary to build or erect a cabinet for the medium. One of the simplest and least expensive methods of building or erecting a cabinet for the medium is as follows: Take a large piece of dark cloth, cotton or woolen, or else a large shawl, and fasten it by stout twine or cord across a corner of the room. It will be better if the curtain is made in two pieces, so as to allow it to part in the middle for the purpose of the entry and exit of the medium, and for the purpose of allowing the materialized spirit form to show itself to the circle. It is not necessary that all light be excluded from the cabinet, and therefore it need cause no worriment if a little light filters in over the top of the curtain; but the lights in the main room should be kept burning "dim and low," not only for the purpose of aiding in the actual work or materialization, but also in order to preserve the proper conditions when the materialized spirit presents itself between the opened curtains.