From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
To Make Yourself Invisible.
Pierce the right eye of a bat, and carry it with you and you will be invisible.
Timeline of related events
1725Publication of Egyptian Secrets of Albertus Magnus (lists this spell)
1869English-language translation of Egyptian Secrets (lists this spell)
In this decade: Publication of The Book of Forbidden Magic (lists this spell)