Found in the first part of the Hariot text, Hariot describes this substance as a boon for physicians and surgeons. Quinn in The First Colonists suggests that this is a medicinal clay. Cf. lemnian earth, samian earth and kaolin earth. “11.17–18 Wapeih ... terra Sigillata ] The native term suggests “white clay”; the Latin is a term for Lemnian earth.” (Paul Royster edition of Hariot). - Matt