... so fall out, that a Voice or Musick gradually rise or fall more than Seven Notes; The subsequent 8th, 9th, or 10th, will in the same order proceed, bearing the like Relation each to the other, as the 1st. 2d. 3d, &c. to which they respectively are Eights. And so that from hence every Eighth Note, being in Nature alike, is called by the name of that to which it is in an Eighth; however above or below it; and for the better understanding the various Musical Compositions out of these Notes, Musicians ... — The School of Recreation (1696 edition) • Robert Howlett
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