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1 Or "blood-stone," mentioned already in Chapter 25 of this Book.
2 He is evidently speaking here of the red peroxide of iron.
3 Vermilion. See B. xxxiii. c. 37.
4 Literally, "split" stone; so called, probably, from its laminated form. Ajasson identifies it with yellow or brown iron ore, known in Mineralogy as Limonite, or Brown Hematite.
5 "Explendis oculorum lacunis."
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