Albertus Magnus, [2], [7], [18], [111].

Alexander Aphrodiseus, [3], [48], [92].

Alexandria, Hero of, [58].

Alfonso, Diego, [178].

Alfonsus the Wise (Alphonsus X.), [237].

Amalfians said to have first constructed the compass, [4].

Amatus Lusitanus, [2].

amber, [47], [49]-[60], [85], [112], [116].

amethyst, electrical properties of, [48].

amianth, [11].