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].