THE TARTINI FIDDLE TRICK.

Granting any two sounds are drawn from two instruments at the same time, there will be heard a third sound, the more perceptible as the listener is near the middle of the distance between them.

If the two sounds are succeeding ones in the order of consonance, as, for instance, the octave and the twelfth, the double octave and the seventeenth major, &c., the sound resulting will be the octave of its principal.