Meteorologica, [35], [39].

on material of the metals, [19], [20].

on the element of earth, [43].

on motions, [45], [219], [225].

on primary form, [65].

on the Primum Mobile, [220].

on animate nature of planets, [208].

armature, [87].

armed loadstones, [86], [87], [88], [89].

Arnaldus de Villa nova, [2], [7].