MENTAL PHENOMENA cover another wide range of mediumistic phenomena, among which may be mentioned the following, viz., involuntary or automatic writing and drawing, writing by means of the planchette or "ouija" board or similar mechanical aid to writing, clairvoyant perception of spirits, clairaudient hearing of spirit voices, prophetic utterances of spirits, impersonating and inspirational control of the medium. Mediums are frequently so thoroughly "under the influence or control," especially in private circle seances, that they seem to have been transformed into another personality. Sometimes the medium through which the spirit is manifesting will have his facial appearance changed so completely that persons present will recognize in the changed appearance the looks of the spirit as known when it was in earth life. The Value of Phenomena. The chief value of physical mediumistic manifestations is not, as generally supposed, that of affording entertainment or food for thought for those witnessing them, but rather that of affording proof of the possibility of spirit communication, particularly when spirit identity is established through the manifestation of the phenomena. A writer says of this class of phenomena: "A good psychographic medium will usually obtain writing between closed slates, which may be brought by the investigator, who can insist upon their not leaving his sight, and not even leaving his hand. We have obtained writing on paper that we had previously marked, which was then covered by our own hand, and a friend's and was untouched by the medium. On another occasion, a slate which we had personally cleaned was laid on the floor (fully six feet from the medium) with a small piece of pencil under it (in broad daylight), and on taking it up shortly afterwards there was found written on the under side a long message of a private nature from a deceased friend, of whom we were not thinking. Such phenomena as these are still good and impressive, they cannot be counterfeited under like conditions, and even when no proof of identity is given in connection with the writings, they point so distinctly to the action of a discrete, disembodied intelligence as to compel the recognition of their spiritual origin. The evidential utility of physical phenomena lies in their being inimitable by fraud. Imitations can of course be made which might satisfy the credible and the gullible, but the conditions for testing the phenomena we have specially referred to are so simple that no rational investigator need be deceived; first, to be sure that the slate, paper, or panel to be used is perfectly blank; second, that it does not leave the hand of the inquirer, or if it does, that it is marked in such a way that there can be no doubt of its identification when it is returned to him; and thirdly (with paintings), to observe if the paint be wet, and note the time occupied in their production." Trance Condition Not Essential.