AN ORIGINAL ORGAN.

The professors of Cornell ColTegu, U.S.A., possess an organ which differs radically from all ordinary organs. It was invented by You Helmholtz, and it contains a purely mathematical scale. It was made for the composition of chords such an are not to "be obtained on an ordinary instrument, and is used to study the vibrations of notes, and of what tonea an organ note is made. Every tone in music is to be found on this organ. For instance, what are known as sharps and flats on a piano are ni.fi really sharps and flats. C sharp an<|. D flat are struck on the same Wiufc key, but, strictly speaking, the blaclc key is neither j it is a note or tone situated midway between 0 sharji aud D ilat. If both of the latte* were on the piano, however, the difference between them is co slight that it -would confuse the player. So a compromise is made, arid the two are blended, or, rather, tbo tone midway between them is us-ed. But in Cornell the organ con*;u,i9 keys lur every note id tho scale, nn matter Low tine the gradation. With it students can learn just how a note on the organ is built up. Certain notes on the organ aro made up of certain other notes. On the ordinary piano you would not to be able to illustrate what these notes are. You would need tho true sharps and flats in ordor to compose such notes. Tba overtones ou the domestic, instrument wou'.d be quite different. Thn p';i,-o flttu which can here be accurate]* denoted, is very much curtailed co the piano. Used in conuectiotj wit.i this order is a complete set of resou. dtors, or tuning forks In or.tft to liod out how many resonators ar« iuvolved by a given note it is only "necessary to strike that note 1 , Thasp forks which resound la sympathy with it are to be ineludsi hi ih£ nlftke-up of the not©. Th« etieni oam **• aofe laoladii ia it,