Proceedings of the Royal Society 
No. 
No. 
43. 
f3+ 
1376 
54. A 3 
1728 
44. 
]73+ 
1408 
55. A 3+ 
1760 
45. 
Fis 3 
1440 
56. b 3 
1792 
46. 
Fis 3 + 
1472 
57. B 3 
1824 
47. 
g 3 
1504 
58. Ais 3 
1856 
48. 
G 3 
1536 
59. Ais 3 + 
1888 
49. 
As 3 - 
1568 
60. h 3 
1920 
50. 
Gis 3 ~ 
1600 
61. H 3 + 
1952 
51. 
As 3 
1632 
62. H 3 ++ 
1984 
52. 
a 3- 
1664 
63. c 4 ~ 
2016 
53. 
a 3 
1696 
64. C 4 
2038 
I have also a series of 64 resonators, tuned to these 64 tones, and 
having corresponding numbers. When tone No. 12 on the over- 
tone apparatus is sounded, and the narrow end of resonator No. 12 
is placed in the ear, the instrument sings into the ear of the 
observer with great intensity. I have thus in the group of resona- 
tors an apparatus for analysing any compound musical note into its 
constituent tones ; and, in the overtone apparatus, I have a means 
of checking the sensation of the listener by sounding, with much 
greater intensity, the tone corresponding to the resonator by which 
he heard any particular tone in a compound note. The method I 
adopted was,- — ls£, to strike a note on the piano, which, of course, 
consisted of a fundamental tone, and of certain overtones; 2d, to 
allow the person whose ear was being examined to listen with the 
various resonators until he selected one by which he heard a tone 
(one existing in the note, and strengthened in intensity by the 
resonator); 3 d, after the listener had satisfied himself that he 
clearly heard the overtone ringing in his ear, the note on the piano 
was arrested, the stop of the overtone apparatus corresponding to 
the overtone was withdrawn, so as to sound the overtone, and the 
listener had to decide whether or not this was the same sound as 
the one he heard when listening to the musical note. The result 
in the ten cases I examined was as follows : — In .nine of the cases 
the overtone was readily perceived ; and in the tenth, the lower 
overtones of the series were observed directly, whereas the higher 
overtones were not noticed by means of the resonator, but were 
clearly observed when those overtones were sounded on the over- 
tone apparatus. This individual asserted he had often noticed he 
