AEOLINA, the original and more elegant name of the hum ble instrument familiarly known as the mouth-organ, another name for it being the mouth-harmonica. It was invented in 1829 by Sir Charles Wheatstone, who also invented the concertina, em bodying the same principle, and consists simply of free reeds arranged within a small metal box, so that, each reed having a separate air aperture, it is possible by moving the instrument to right and left against the lips, to produce different notes. The mouth-organ may be regarded as a humble relation not only of the concertina (q.v.) and the accordion (q.v.) but also of the harmonium (q.v.).