A History of Inventions, Discoveries, and Origins, Volume 2 (of 2)Note 1216 — SALTPETRE. GUNPOWDER. AQUAFORTIS.William Johnston translationMémoires de l’Acad. de Bruxelles, 1777, i. p. 345.◇Copy noteReturn to SALTPETRE. GUNPOWDER. AQUAFORTIS.