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shares of five hundred pounds each, their works being at Ravenshead, in Lancashire. These works have been very successfully conducted, and, according to a late writer, are rivalled by none, excepting those at "St. Gobain," in France. Since the excise duty on plate-glass has been repealed, its manufacture has increased to a wonderful extent; the quantity used in the construction of the Crystal Palace, for the World's Fair, being probably many times larger than that manufactured twenty years since in the kingdom of Great Britain in any one year.     An English paper states that Roger Bacon, at sixty-four years of age, was imprisoned ten years for making concave and convex glasses, and camera-obscura and burning-glasses.     It is to many persons matter of great surprise that the manufacture of plate-glass has never been introduced into this country. The whole process is a simple one. The materials are as cheap here as in England or in France. Machinery for the polishing of the surface is as easily procured, and water-power quite as abundant, as in either country. The manufacture, with the materials so ready to the hand, and these together with the skill, labor, and demand, increasing every year, is most certain to