- The Gnostics & Their Remains
- Antique Gems: Their Origin, Uses, and Value As Interpreters of Ancient History; and As Illustrative of Ancient Art: With Hints to Gem Collectors
- Early Christian Numismatics: Other Antiquarian Tracts (Classic Reprint)
- Julian the Emperor: Containing Gregory Nazianzen's Two Invectives and Libanius' Monody With Julian's Extant Theosophical Works
- The Claims of Japan and Malaysia Upon Christendom, Volume 2