Olaus Magnus, [5], [6].

opal becomes electrical, [48].

orbe of virtue, [76], [96], [191], [205]

orbes of planets, [208], [215].

Oribasius, [2].

Orpheus, [11], [61], [209].

Oviedus, Gonzalus (Gonzalo Fernandez de Oviedo y Valdès), [4].

Pantarbes, [111].

Paolo (Paulus Æginæ), [35].

Paolo, Rev. Maestro (Fra Paolo Sarpi), [6]