Note 1164 — BOOK XXXIII. THE NATURAL HISTORY OF METALS.647 (continued 2)

A blue powder; see Chapter 27 of this Book. Beckmann has the following remarks on this and the preceding lines: “The well-known passage of Pliny in which Lehmann thinks he can with certainty discover cobalt, is so singular a medley that nothing to be depended on can be gathered from it. The author, it is true, where he treats of mineral pigments, seems to speak of a blue sand which produced different shades of blue paint, according as it was pounded coarser or finer. The palest powder was called lomentum, and this Lehmann considers as our powder-blue. I am, however, fully convinced that the cyanus of Theophrastus, the cæruleum of Pliny, and the chrysocolla (see Chapter 26), were the blue copper earth already mentioned, which may have been mixed and blended together.”—Hist. Inv. Vol. I. pp. 480, 481. Bohn’s Edition.