240
EXPOSITION AT VIENNA.
the surface appears to he thickly set with turquoise. Each cup and saucer is carefully mounted in a stuffed morocco case. . The small set of six pieces was valued at about $6,000.
Wedgwood, Josiah & Sons, Etruria, Staffordshire.— This well-known establishment, identified with the growth of artistic pottery in Britain, was worthily represented by some of its best productions of the jasper or Wedgwood ware: white bas-reliefs on colored grounds, unglazed imitations of the famous Henri-deux ware ; art-pottery paintings by M. Lessore; paintings on raw enamel, by M. Bean; majolica vases; dessert and fancy articles. Also by enamelled, printed, and cream-colored earthen ware ; chemical and telegraphic, and sanatory and plumber’s ware. Wedgwood’s basalts are dark poreelanous biscuits of great hardness, and capable of receiving a high polish. They resist acids, and bear a high degree of heat without injury. The white porcelain biscuit has similar properties. The jaspar bodies are peculiarly adapted to cameo portraits and all bas-relief decorations, as the ground may be of any desired shade of color, while the raised figures are white. The basis of many of the medallions and plaques is the white body overlaid by a coating of the dark. I have tested the hardness of thvse tablets, and find them scarcely inferior to quartz, or about 6V on the mineralogical scale, being superior to felspar. They are still made at the works from the original moulds by Flaxman. According to the chemist Salvetat, Wedgwood ware consists
of—
Silica, . . . . . . * 66.49
Alumina, . . . . . . 26.00
Oxide of iron, ..... 6.12
Lime, ...... 1.04
Magnesia, ...... 0.15
Alkalies, * . . . . . 0.20
The " jaspar ware ” may be regarded as a vitrified stone'' ware of fine quality. The vitrifying substances added to the clay body are flint, ground glass, felspar, sulphates and cal'- bonates of lime and of barytes. White jaspar contains ft'Oi 11 15 to 30 per cent, of plastic blue clay, 0 to 15 per cent, of