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difference, the shapes of the various tools are the same.     At the best, the manufacturers of glass in France were for a long period much inferior to the Venetians and Bohemians; but after the introduction of window-glass, from Venice, the making of crystal glass greatly extended and correspondingly improved.     In the year 1665 the government of France, desirous of introducing the manufacture of window-glass, offered sufficient inducement in money and privileges to a number of French artists (who had acquired the process at Murano, at Venice) to establish works at Tourtanville. At these works the same system of blowing was followed as that used in the Venetian glass-works. A workman, under this system, named Thevart, discovered the art of casting plate-glass, and obtained from the government a patent for the term of thirty years. He erected extensive works in Paris, and succeeded in what was then deemed an extraordinary feat, casting plates eighty-four inches by fifty inches, thereby exciting unbounded admiration.     The credit of the invention of casting plates of glass belongs to France, and the mode then adopted exists to the present day, with but slight