621.
Kretschmer finds that Albert supports the doctrine, and Eicken finds that he denies it--a fair proof that Albert was not inclined to state his views with dangerous clearness.

For D'Oresme, see Santerem, Histoire de la Cosmographie, vol.i, p.142.For Peter of Abano, or Apono, as he is often called, see Tiraboschi, also Guinguene, vol.ii, p.

293; also Naude, Histoire des Grands Hommes soupconnes de Magie.

For Cecco d'Ascoli, see Montucla, Histoire de Mathematiques, i, 528; also Daunou, Etudes Historiques, vol.vi, p.

320; also Kretschmer, p.59.