Some persons are so disappointed because they have not obtained results after two or three sittings that they give up further efforts. It would perhaps amaze such persons to know that many of the world's most celebrated mediums have, in the beginning of their development circle work, sat for several weeks, or even several months, at frequent intervals, without obtaining more than the most meagre results; but they afterwards developed the most marvelous power. An extreme case is cited in the history of spiritualism, in which a couple sat night after night for six months, without missing a sitting and without being rewarded by a single physical result; but after this tedious and discouraging wait, all at once, as it were, the spirits secured the most perfect kind of communication through them, and difficult table tippings and levitation, convincing raps, messages, writings, and finally materializations follows, until their fame spread all over the world of spiritualism. Building Lines of Communication. Just how long it will require to obtain convincing results at the development circle is a matter largely dependent upon certain conditions. Much, of course, depends upon the faculty of the medium to adjust and harmonize himself with the spirits, so as to furnish a "clear wire" for them to operate over. Again, much depends upon the character of the persons constituting the circle. A circle composed of harmonious, helpful persons will do much to hasten the coming of the manifestation, whereas one composed of inharmonious, sceptical, impatient, and materialistic persons will do much to retard the progress and development of the mediumistic powers. Developing Concentration.