A History of Inventions, Discoveries, and Origins, Volume 2 (of 2)Note 1237 — SALTPETRE. GUNPOWDER. AQUAFORTIS.William Johnston translationPlin. xxiv. 1; xxxi. 3, § 22. Geopon. ii. 5, 14, p. 85.◇Copy noteReturn to SALTPETRE. GUNPOWDER. AQUAFORTIS.