On each of the keyboards any of the stops, from the "foundation" group, the "woodwind" group, the "string" group, the "brass" group and the "percussion" group, may be drawn, and they may be drawn at 16 feet, at 8 feet, and, in some instances, at 4 feet, at 2 feet, at twelfth and at tierce pitches. Arranged in this way an organ becomes an entirely different instrument. It is very flexible, for not only can the tones be altered by drawing the various stops at different pitches, but the various groups may be altered in power of tone independently of each other. At one moment the foundation tone may entirely dominate, by moving the swell pedals the strings may be made to come to the front while the foundation tone disappears; then again the woodwind asserts itself whilst the string tone is moderated, till the opening of the box containing the brass allows that element to dominate. The variety of the tonal combinations is practically endless. The adoption of this principle also saves needless duplication of stops. In the organ at St. George's Hall, England, there are on the manuals 5 Open Diapasons, 4 Principals, 5 Fifteenths, 3 Clarinets, 2 Orchestral Oboes, 3 Trumpets, 3 Ophicleides, 3 Trombas, 6 Clarions, 4 Flutes, etc., etc. In the Hope-Jones Unit organ at Ocean Grove effects equal to the above are obtained from only 6 stops. The organist of Touro Synagogue, New Orleans, has expressed the opinion that his ten-stop Unit organ is equal to an ordinary instrument with sixty stops. SYMPATHY.