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150               THE BLACK PRINCE'S RUBY.
of course supposed to be endowed with miracu­lous powers and affinities by the ancients; as, for instance, "the Osculan," dedicated by the Lady Hildegarde to St. Adelbert of Egmund. Of this stone, says a sixteenth-century writer:
"In the night-time it so lighted up the entire chapel on all sides that it served instead of lamps for the reading of the Hours late at night, and would have served the same purpose to the present day, had not the hope of gain caused it to be stolen by a runaway Benedictine monk, the most greedy creature that ever went on two legs."
The Black Prince's Ruby is only by courtesy called a ruby. It is in reality a "spinel," a stone of inferior hardness and less intense color and brilliancy thatvthe true ruby. All the large historic stones which are called rubies are de­clared by Mr. King to be undoubted spinels. There is yet another class of rubies of an inferior type known as " balais," a name probably derived from the place in India whence they came. The inferior ruby is found in all parts of the world ;