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sunk money in carrying on the works, and to prevent further losses they have now been finally destroyed, and the ground turned into a potato-patch. [From the "Scientific American."] ETCHING AND ORNAMENTING GLASS.     The hardest glass may be etched and frosted with a peculiar liquid acid, and also with this acid in the condition of a vapor. When powdered fluor spar is heated with concentrated sulphuric acid in a platinum or lead retort, and connected with a refrigerator by a tube of lead, a very volatile, colorless liquid is obtained, which emits copious white and suffocating fumes. This is hydrofluoric acid, a dilute solution of which attacks glass with avidity, while neither sulphuric, nitric, nor muriatic acid has the least effect upon it. In a diluted state it is employed for glass etching, for which purpose it is kept in a lead vessel, because it has very little affinity for this metal. The vapor of this acid is also used for the same purpose. The glass to be operated upon is first coated with a ground of wax, and the design to be etched is then traced through the wax with a sharp instrument. In a shallow