Note 3201 — BOOK XXXI. REMEDIES DERIVED FROM THE AQUATIC PRODUCTIONS.

“Spuma nitri.” An accidental property, Beckmann says, of the same salt that has been previously called “Chalastricum,” “Halmyrax,” “Aphronitrum,” and “Agrion.” In his opinion, “the ancients were acquainted with no other than native nitrum, which they called artificial, only when it required a little more trouble and art to obtain it.”—Hist. Inv. Vol. II. p. 502. Bohn’s Ed.