THE DOCTRINE OF ENERGY. 



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AN ELEMENTARY EXPOSITION OF THE DOCTRINE OF ENERGY. 



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ELEMENTS OF METALLURGY: 



A Practical Treatise on the Art of extracting Metals from their Ores. 



By J. ARTHUR PHILLIPS, M.Inst.C.E., F.G.S., F.C.S., &c, 



Ancien Eleve de l'jfccole des Mines, Paris. 



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