an organ stop ordinarily furnished with from two to five comparatively small pipes to each key. I t is compounded of the higher-sounding and therefore shorter members of the ' foundation ' and ' mutation ' classes of stops, combined or ' mixed,' and arranged to draw together, as in practice they are seldom required to be used separately. The Mixture represents or corroborates the higher consonant harmonic sounds suggested by nature, and in the bass produces tones to the third or fourth octave above the unison or chief foundation tone. As the musical scale ascends the higher harmonics become weak and inaudible to the e a r ; hence in a Mixture stop it is customary to discontinue the higher ranks as they ascend, one or more at a time, and insert in lieu a rank of lower tone than was previously in the stop, but appearing as a separate stop. This alteration is called a ' break.' A Full Mixture is generally of three ranks, consisting of the following intervals in relation to the unison : 15, 19, 22, or c", g", c when c is struck. (See M u t a t i o n and J. J. Wedgwood's Dictionary of Organ Stops.) E . J . H .