AN ENGRAVED MERCURY-TWIST CORDIAL-GLASS of drawn shape, the bowl with fruiting-vine, the stem with an air core enclosed within four spiral threads, on a conical foot, 17.5cm. high; and a mercury-twist cordial-glass of drawn-trumpet shape, the stem with two entwined corkscrew spirals, on a conical foot, 17cm. high, circa 1750 (2)