A History of Inventions, Discoveries, and Origins, Volume 2 (of 2)Note 1226 — SALTPETRE. GUNPOWDER. AQUAFORTIS.William Johnston translationVirg. Georg. i. 193.—Plin. xviii. 7. 845.—Geopon. ii. 36, p. 184.◇Copy noteReturn to SALTPETRE. GUNPOWDER. AQUAFORTIS.