A History of Inventions, Discoveries, and Origins, Volume 2 (of 2)Note 1246 — SALTPETRE. GUNPOWDER. AQUAFORTIS.William Johnston translationDe Subtilitate, xiii. 3. p. 71. ed. Francof. 1612, 8vo.◇Copy noteReturn to SALTPETRE. GUNPOWDER. AQUAFORTIS.