BN 13334, 12th century, fol. 52-, de arte didascalica, is probably our treatise, although the catalogue names no author. BN 15256, 13th century, fol. 128-. Still other MSS will be mentioned in a subsequent note. [12] _Didasc._ VI, 3. [13] _Ibid._, II, 17. [14] _Didasc._ III, 2. [15] _Ibid._, VI, 3. [16] A similar distinction will be found in the _Glosses on the Timaeus_ of William of Conches (Cousin, _Ouvrages inédits d’Abélard_, 1836, p. 649), one of Hugh’s contemporaries of whom we shall presently treat. A little later in the twelfth century John of Salisbury (_Polycraticus_, II, 18) makes the distinction between the two _mateses_ or mathematics lie rather in the quantity of the penultimate vowel “e”. In the thirteenth century Albertus Magnus (_Commentary on Matthew_, II, 1) also distinguished between the two varieties of mathematics according to the length of the “e” in “_mathesis_”; but he did not regard the second variety as necessarily superstitious, but as divination from the stars which might be either good or bad, like Hugh’s _astrologia_. Roger Bacon mentioned both methods of distinction between the true and false mathematics; but statements in his different works are not in agreement as to which case it is in which the “e” is long or short. In the _Opus Maius_ (Bridges, I, 239 and note) and _Opus Tertium_ (caps. 9 and 65) he states that the vowel is short in the true mathematics and long in the superstitious variety; but in other writings he took the opposite view and declared that “all the Latins” were wrong in thinking otherwise (see Bridges, I, 239 note; Steele (1920) viii). In a twelfth century MS at Munich (CLM 19488, pp. 17-23) a treatise or perhaps an excerpt from some longer work, entitled _De differentiis vocabulorum_, opens with the words, “Scire facit mathesis et divinare mathesis.” Roger Bacon says (Steele, 1920, p. 3), “Set glomerelli nescientes Grecum ... ex magna sua ignorancia vulgaverunt hos versus falsos: Scire facit matesis, set divinare mathesis; Philosophi matesim, magici dixere mathesim.” [17] _Didascalicon_, I, 7. [18] _Didasc._ VI, 15 (Migne PL 176, 810-12). [19] BN nouv. acq. 1429, 12th century, fols. iv-23, and CLM 2572, written between 1182 and 1199; both end with the thirteenth chapter of Book VI, or at col. 809 in Migne. St. John’s 98, 14th century, fol. 145v, also ends at this point. Jesus College 35, 12th century, is mutilated at the close. Other early MSS, however, include the passage on magic in the _Didascalicon_, and end the sixth book with the closing words of the account of magic, “Hydromancy first came from the Persians”: see Vitry-le-François 19, 12th century, fols. 1-46; Mazarine 717, 13th century, #9, closing at fol. 97v. The passage on magic is also cited as Hugh’s by Robert Kilwardby, archbishop of Canterbury 1272-1279, in his work on the division of the sciences, cap. 67: MSS are Balliol 3; Merton 261.