may be considered to be of white crystal Glass. About the same time, his assistant prepares a casing of colour, B, knocking off the knob at C, to open and shape it, as D, somewhat like the bowl of a wine-glass, or the broad-end of a large egg-shell; this is set into a metal stand, E, on the floor, merely to steady the case, or shell, B; while the blower takes the lump of Flint or white Glass, A, and gently blows it into the coloured case, or shell, B, to which it immediately adheres; and when submitted to the flame of a pot-hole, or, if a large piece, to the flame of the castor-hole, it is found to weld perfectly, as F. If various coverings are needed, as many coloured shells must be prepared as required, and each time melted in by fresh warming, until the entire number are obtained and cased. The whole are afterwards rewarmed, expanded, and shaped into vases, tazzas, or such other articles as the manufacturer requires, by blowing, and the usual appliances of moulds, tools, rotary motions, &c., as have been explained in former manipulations. If cased coloured Glass for windows be made, the cased ball must be larger, expanded, elongated, and made into a cylinder, or muff, precisely as in optic plate, or a lamp-glass; but in large sheets, after shearing through the whole length of the cylinders, and