A History of Inventions, Discoveries, and Origins, Volume 2 (of 2)Note 1217 — SALTPETRE. GUNPOWDER. AQUAFORTIS.William Johnston translationElementa Chemiæ. Lugd. Bat. 1732, 4to, i. p. 767.◇Copy noteReturn to SALTPETRE. GUNPOWDER. AQUAFORTIS.