Note 3199 — BOOK XXXVII. THE NATURAL HISTORY OF PRECIOUS STONES. (continued 2)

Brotero is of opinion that those were Belemnites, more commonly known as “thunderstones.” The reading “bætyli” is doubtful; but Parisot says, on what authority does not appear, that “Betylus” meant “Great father,” and that this name, as well as “Abaddir” of similar signification, was given by magicians to aërolites or meteorites used in their enchantments.