Chapter 31: Book II., "earths"--clay, Lemnian earth, chalk, ochre, etc.; Book III.,
"solidified juices"--salt, _nitrum_ (soda and potash), saltpetre, alum,
vitriol, chrysocolla, _caeruleum_ (part azurite), orpiment, realgar, and
sulphur; Book IV., camphor, bitumen, coal, bituminous shales, amber;
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