the hammer fer the high tones. The reso nance of sound is obtained by means of boxes "fthin wood i mmedi ately behind the tuning forks. The lower tones are produced by spiral wire� similar to those used as substi· tutes for b ells ill common clocks. Some of the notes in this instrument are very sweet and of considerable volume. There arpear�, however, some difficulties to be overcome, such as want of volume of tone in extremities of the scale, limited range, and the diff erent character of

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... from the wires; but which the in ventoI' b elieves to be surmountable.