Note 3030 — BOOK XXXI. REMEDIES DERIVED FROM THE AQUATIC PRODUCTIONS.

“Statera.” Ajasson remarks that it does not require an instrument very nicely adjusted to indicate the difference in weight between pure and very impure water. Synesius, Ep. xv., gives an account of the “hydroscopium” used by the ancients for ascertaining the weight of water. Beckmann enters into a lengthy examination of it, as also an enquiry into the question whether the ancients, and among them Pliny, were acquainted with the hydrometer. See his Hist. Inv. Vol. II. pp. 163-169. Bohn’s Ed.