TO THE READER

Decorative woodcut initial "N" depicting a seated figure in a pastoral landscape, likely a scholar or saint, framed by architectural elements.

Non It has not been possible, Studious reader, despite all the diligence that was used, to ensure that in the printing of these present Demonstrations, some errors of some importance did not occur in some pages of some books, even if they did not happen in all. However, before you set yourself to examine anything: you shall patiently correct the Number of the pages: and thereafter the errors as they come: so that when you wish to use the Table of the most notable matters contained in the work (which is placed at the end of the book), you may have ready at hand what you seek. You shall therefore restore to their places the following Numbers: because those found in place of these are false.

1. 27. andauamo [we were going].
2. 28. Diatessaron original Greek: "Διατεσσαρον." A musical interval of a perfect fourth..
43. in the example under the letter b, the number 2 should be.
47. in the example under the letter e, the number 6 should be.
49. 37. should be 6 3/4.
51. 35. should be 8/3.
52. in the example in the last line, it should be 6/9 and 2/3.
75. 4. should be 10 1/8.
77. at the end of the example, it should be 1 1/2 over 417/512.
78. 22. should be 3/4.
82. in the margin: Epistle 1, book 2 original Latin: "Epist. 1. lib. 2.".
86. 24. and 33. in place of "Parts," it should say Consonances original: "Cōsonāze." Intervals that are pleasant to the ear..
90. 36. Chapter 25 of the First part.
94. in the margin: Harmonics, book 1, chapter 15 original Latin: "Harmo. lib. 1. cap. 15." Referring to Ptolemy's work on music theory..
95. 21. That if we consider.
97. 13. And the string, C.
100. in the example: 5 1/3.
111. 43. which we call Imperfect: which are supremely.
50. All this, which I have described here, is that which.

129. 13. the Diaschisma A very small musical interval. being the half of the minor Semitone: and the Schisma The smallest interval in ancient Greek music theory. the half.
16. minor Semitone: or rather.
134. 10. Twenty-sixth proposition (as I told you a little while ago) contains.
135. 6. proposition XXIII.
152. 19. Denominator.
153. 21. between eb and cb.
156. in the example in the lower part, it should be 18. 17. 16.
174. in the example: 15/16 and 1/15.
177. 34. is smaller than the Apotome In Pythagorean tuning, the interval left when a minor semitone is subtracted from a whole tone..
178. 1. proportion of the Apotome.
5. those of the Apotome.
12. smaller than the Apotome.
20. they called Apotome original Greek: "Αποτομη.".
187. in the example above the number 3072, the letter n is missing.
263. in the margin: Lucian original Latin: "Lucianus." The Greek satirist..
279. 33. also Five Hexachords original: "Hexachordi." Six-note musical scales..
295. 25. the Seventh and the Tenth [intervals] do not.
296. in the example under the letters a and ♮, where it says "major Semitone," it should say "Tone."
301. at the beginning of the example it should say STRINGS original: "CHORDE.", and in the second-to-last row the letter G is missing at the beginning.