Note 19 — Chapter I · On the Indistinctness of Ideas of the Middle Ages.
Reading edition
Roger Bacon, in his Specula Mathematica, cap. i., says “Harum scientiarum porta et clavis est mathematica, quam sancti a principio mundi invenerunt, etc. Cujus negligentia jam per triginta vel quadraginta annos destruxit totum studium Latinorum.” I do not know on what occasion this neglect took place.