XEVIT. Ona grand practical Improvement in the Harmony 
of Musical Instruments, by the Introduction of the Rev. 
Henry Liston’s Patent ENHARMONIC ORGAN; with the 
Names of the 60 distinct Sounds which it produces in 
each Octave, from 20 Pipes, and their Intervals calculated. 
By Mr. Joun Farry. 
To Mr. Tilloch. 
SIR, Is your twenty-seventh volume, page 206, I endea- 
voured to call the attention of Lord Stanhope and other 
patrons of musical improvements, to the perfecting of an 
Organ capable of performing in perfect twne, without any 
tempered concords throughout the whole scale of 24 keys, 
on which the late Mr. Maxwell, of Broomhelme, in Scot- 
land, had written, and had applied the same successfully to 
the practice of the violin performer: and in your same 
volume; p. 315, I further said, ¢¢ It follows, from the ex- 
cellent writings of Mr. Maxwell, that, were one of the parts 
of a concert, the bass for instarice, to be performed on a 
certain systeni of fixed tones (which it will be seen is quite 
consistent with perfect chords), that the number of notes 
would in this case not much exceed 60 within the octave, 
to effect perfect harmony, or the avoiding of all tempera- 
iments therein, in modulating through 24 keys.” 
In the course of much communication and correspon- 
dence with Musical Theorists since the above period, I have 
been surprised to find them, either insensible or inattentive 
to this grand desideratum in thusic, and several of them 
disposed | even to ridicule the very attempt. 
It gives ne great pleasure therefore to be able to state, 
that the above is now no longer a matter of doubtful spe- 
culation ; but that myself and ‘several others have heard, and 
Woubiless hundreds of others will shortly hear, an Organ 
thus perfected, in Scotland, by the Rev. Henry Liston, and 
now exhibiting at Flight and Robson’ S, organ- buildets, i in 
St. Martin’s Lane; the exquisite effect of which, _ parti- 
eularly in accompanying vocal music, far exceeds all that 
Maxwell or myself had written or perhaps conceived of the 
harmony of such an instrument. The patentee is now 
receiving subscriptions for a wark, which will s satisfactorily 
explain, Ist, The mathematical theory, the construction 
of the instrument, and the application of the theory to tuning 
it; and, 2dly, An application of his theory to the various 
species ‘of musical composition, The first part-of this 
Vol. 37. No. 156. April 1811. 3 gen- 
