Acosta, Josephus, [5].
adamant, [11].
æquator, the magnetick, [13], [79].
Aetius Amidenus, [2].
Affaytatus, Fortunius, [6].
agate, non electrick, [51], [53].
Agricola, Georgius, [2], [3], [10], [19], [26], [111], [112].
Agrippa, H. Cornelius, [3].
aimant, [11].
Albategnius (Muhammad ibn Jābir, Al-Battāni, [237].