generating air, and at the same time is susceptible of contraction or expansion, as, in the course of manufacture, the Glass becomes hot or cold. It may previously be formed into any device or figure, by either moulding or modelling; and may be painted with metallic colours, which are fixed by exposure to a melting heat. These ornaments are introduced within the body of the Glass while the latter is hot, by which means the air is effectually excluded; the incrustation being thus actually incorporated in the Glass. In this way, every description of ornamental Glass-ware has been decorated with embossed, white, or coloured arms, or crests. Specimens of these incrustations have been exhibited not only in decanters and win-glasses, but in lamps, girandoles, chimney ornaments, plates, and smelling-bottles. Busts and statues, on a small scale, caryatides to support lamps or clocks, and masks, after the antique, have also been introduced with admirable effect.

The composition used in the patent incrustations is of a white silvery appearance, which has a superb effect when inclosed in richly-cut Glass. Miniature landscapes, &c., have been enamelled upon it, without the colours losing any of their brilliancy; and thus, instead of being painted on the surface of the crystal, there are ornemants embodied in it.

A most important advantage to be derived from this elegant invention is the preservation of inscriptions. Casts of medals and coins do not afford security of perpetuating them; but, the inscription, when once incrusted in a solid block of crystal, like the fly in amber, will effectually resist for ages the destructive action of the atmosphere. Had this art been known to the ancients, it would have perpetuated to us many interesting memorials. In laying the foundation of