Note 3125 — BOOK XXXI. REMEDIES DERIVED FROM THE AQUATIC PRODUCTIONS.

“Intra specus suos.” On this passage, Beckmann says, “From what is said by Pliny it may with certainty be concluded that this salt was dug up from pits or mines in Africa.—Many kinds of rock-salt, taken from the mines of Wieliczka, experience the same change in the air; so that blocks which a labourer can easily carry in the mine, can scarcely be lifted by him after being for some time exposed to the air. The cause here is undoubtedly the same as that which makes many kinds of artificial salt to become moist and to acquire more weight.”—Vol. II. p. 399, Bohn’s Ed.