Of Winds and Sounds.

! er a certain Interval; and the shorter the^erval of the Co-incidence, the more^peeable is the Effect or Consonance toEar; consequently, those which are^°ft frequent produce the most perfect Con-°aance or Concord, as it is commonly called.**Vn the Times of Vibration, therefore,?re equal, the Concord is most perfectmore agreeable than any other, andis called Unison.

If the Times of Vibration are as I to 2,Co-incidence will be at every second Vi-sion of the quickest, and so this is theperfect Concord, and is what we com-^°nly call a Diapason, or Octave.

If the Times of the Vibration be as 2,?. 3 » the Co-incidence will be at every

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* r d Vibration of the quickest; which.before is in the next Degree of Perfec-l‘° n > and this is called a Diapente, orIj, Th. If the Times of Vibration are^ 3 to 4, the Co-incidence will be at every^ of the lesser; and this is called the^Tessaron, or Fourth. But this,the next which follow in Order, areso agreeable and pleasant to the judi-Ear, and are therefore called ImperfeSi°pcords. Nor are there above seven

!tes in all the infinite Variety of Tones,

which