| Description | An account of the origins of:
a) natural sulphur from the sulphur works at Pozzuoli near Naples
b) sal ammoniac (ammonium chloride), in particular, recounting letters from Father Sicard, about its preparation in Egypt
c) minerals acids of vitriol
d) saltpetre (potassium nitrate)
e) alum
Deidier sent this account which had not yet been published
Original letter, which now no longer exists, was in French |
| Place origin | Marseille, Provence-Alpes-Cte d'Azur, France |