Note 6 — BOOK X.

[Pg 441][6] This list of four recipes is even more obscure than the previous list. If they were distilled, the first and second mixtures would not produce nitric acid, although possibly some sulphuric would result. The third might yield nitric, and the fourth aqua regia. In view of the water, they were certainly not used as cements, and the first and second are deficient in the vital ingredients.