a 
H.W. Poole on Perfect Harmony, etc. 7 
London. My first knowledge of his valuable services came 
during the vee 5 of the second part of my article in this 
Journal (in March, 1850), by an >ellteie in the Westminster 
Review to an enharmonic organ which he had just brought out 
in London. This led to the reading of his spirited articles on 
music and other subjects in the Westminster Review, and to the 
seeking his acquaintance, which, through a considerable corre- 
spondence, I have had the good fortune to make. I have also 
received his ‘“ Theory and Practice of Just Intonation” and “ De- 
scription and use of the Enharmonic Organ” of his invention, 
“built for the Exhibition of 1851, and an a, tracing the 
identity of design with the En harmonic of the Ancients. London, 
1850.” 8vo. I a obtained, after much search, and by the kind 
efforts of the author, what appears to be the initiative work of 
Gen. Thompson in musical doctrines. Although a work requir- 
ing thorough classical and mathematical knowledge, as well as 
information in several departments of literature and taste, it 
bears the modest title, “Instructions to my Daughter for Playing 
on the Enharmonic Guitar, being an attempt to effect the exec 
of correct harmony, on mn principle analogous to those ~ the maa 
Enharmonic. By a Member of the University of Cambri sp 
don, 1829.” In folio, with illustrations. This work seems 
cient, as he lived as late as A.D. 470. It is clear that there was 
something which these alle ‘“‘enharmonic,” which is declared 
to be the “most accurate.” (Aristides Quintilianus, lib. i, p. 19, 
od. Meib.) That “the name of enharmonic [or harmony] “ 
geen to the genus abounding in the smallest intervals; 
e harmonizing.” (Idem, i, 18.) “The enharmonic, so ‘aie 
pa being taken in the perfect intervalling of whatever i is cube 
armony.” (Id., ii, 111.) With much more to 
j i 
Gen. Thompson i in adopting t the title of Enharmonic: which name 
I also take as appropriate to a system of perfect rh and 
to the instruments which os constructed on its princi 2 
e enharmonic organ of Gen. Thompson had been 
in Sage: without any change in the interior of the organ, all 
sounds contained therein could be given. Every sound of the 
organ was represented in three key-boards, e a some very 
rarely called for, which had abe pi] The organ of 
Mr. Alley and myself had a key-board like of the common 
organs, and the fingering was the same: all Lae were made 
