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Preservation of Stone

Doctor Eugene Robert, of Paris, recommends copper salts as being the best preservatives of stone 6295. To Improve Wine by Electric- in a damp climate. These salts prevent the ity. The process consists in plunging into formation of lichens, to the action of which the vat containing the wine, two plates of M. Robert attributes the destruction of stone. platinum or of silver, having attached to This is, without doubt, true for granite, but them two wires of the same metal, which are its efficiency for sandstone is questionable. connected with the poles of an electric battery. The Bunsen and Daniell's batteries are much used in France for this purpose. The