, in fact it is better in every case,
to draw every reed, letting them lie in a row on the reed board and
going over each one separately, brush the dust from it. This will
improve the tone, or, rather, the tune of the instrument. Dirt on the
tongue of a reed adds sufficient weight to alter the pitch, and if it
is removed, the instrument will generally be in as good tune as when
it left the factory. Simply cleaning an organ in this way is often
called tuning, by inexperienced persons. If it happens that there are
only a few reeds that do not speak, and the owner does not care to pay
for a thorough cleaning, you will find the silent reeds by the method
given under the head "Examination," and, drawing them, clean and
replace.

STOPS.

Each stop on the organ (if there be no dummies) affects either the
tone quality or the power of the instrument. The Vox Humana stop
affects the quality of the tone by operating a fan in the rear of the
instrument or a contrivance contained in a small box, which produces a
tremolo effect. All other stops may be said to affect the power. Stops
having such names as Diapason, Melodia, Dulcet, Celeste, Cremona,
Echo, Principal, Bourdon, Sub Bass, Piccolo, Flute, Dulciana, etc.,
etc., open certain sets of reeds supposed to give forth a tone quality
similar to the instrument whose name it bears, or the tone of the
pipes of the pipe organ bearing such names. These stops operate on
the sets of reeds by raising the mutes which, when closed, stop the
passage of air through the reeds.

The octave coupler stop, sometimes called Harmonique, controls an
arrangement whereby, when a key is depressed, its octave is made to
sound also. "Forte" stops lift the mufflers or swells, and as these
are controlled by the right knee-swell, the Forte stop may be
considered of little value. The left knee-swell, called the Full Organ
swell, as its name implies, opens up the full power of all sets of
reeds and throws on the couplers.

A mere peep into any organ will disclose the mechanical working of
stops, which is in such great variety that we will not attempt to
detail it here.

EXAMINATION.

After a little experience you will be able to make an examination of
an organ and tell just what it needs without so much as drawing a
screw. The reeds are usually divided into treble sets and bass sets;
two octaves of bass reeds, and three octaves of treble reeds
constitute a set. The Diapason stop is nearly always pres