a recreement of mixed metals, in which lapis calaminaris, or zinc in its metallic form, is an ingredient; collected in the furnaces where brass is made from copper and calamine, and where the mixed metals are run. In these furnaces they place, under the roof and about the upper parts of the sides, rods of iron, and sometimes rolls of dry earth, about which the tutty is afterwards found. Therefore the tutty which we use in the shops at this time, owes its origin truly and properly to zinc, which sublimes with a very small fire into a kind of flowers, and, when fused with any other metal, flies from it in abundance under this form, and also frequently takes some part of the metal, more or less, up with it. Hence it is evident, that the tutty or cadmia of the ancients, must have been wholly different from ours, as they used no zinc nor any of its ores in the furnace where they collected it.

Our tutty then is a hard and heavy semimetallic recreement, sometimes met with in the shops in thin flat pieces or flakes, but most abundantly in tubular cylindric pieces, resembling segments of the barks of trees pushed off from the branches without breaking; these are of different lengths and diameters. The finest tutty is that of a fine deep brown on the outside, and of a yellowish tinge within; the thickest, brightest, and most granulated; the hardest to break, and that which has least foulness among it.

Tutty is celebrated as an ophthalmic, and frequently employed as such in unguent and collyria.