CHEMICAL SCIENCE. 295 



tion is filtered and may be then used. The galvanic deposit takes place 

 cold very rapidly, and the results are equal to those obtained by MM. 

 Ruotz and Elkington. 



RESTORATION OF ANCIENT BRONZES. 



M. Chcvreul has recently communicated to the French Academy a paper 

 setting forth researches made by him on certain ancient bronze statuettes 

 brought from Egypt. We take one example. He placed a small com- 

 pletely oxidated effigy of Anubis in a porcelain tube, filled the tube with 

 hydrogen gas, and raised it to a dull red heat. Presently, water, colored 

 green, was seen to condense in the bell glass, and after letting the apparatus 

 cool, " I took out the statuette," he says, " completely revivified. I placed it 

 before the eyes of the Academic, together with the water and chlorhydric 

 acid which represent the oxygen and chlorine of Egypt, now transformed at 

 Paris, by hydrogen, into water and acid." 



ON THE PRODUCTION OF HEMATITE. 



At a recent meeting of the Boston Society of Natural History, Dr. A. A. 

 Hayes stated that he had proved, from careful analysis and examinations of 

 pseudomorphs, as well as the more ordinary forms of hematite, that the in- 

 filtration of an aqueous solution of silicates of proto-peroxides of iron and 

 manganese, caused the production of hematite. The beautiful black, glossy 

 covering, which confers so much beauty on the ores of iron not truly hem- 

 atites, as well as the ore of manganese, is always composed of silicate of 

 proto-peroxide of iron, with silicate of one or both oxides of manganese ; 

 and the compact peroxides of manganese, often owe their density and hard- 

 ness to this compound. 



OREIDE A NEW ALLOY. 



Messrs. Mourier and Valient, of Paris, have recently succeeded in forming 

 an alloy which very closely resembles gold. The materials and proportions 

 used by them are, pure copper, 100 parts (by weight) ; zinc, 17 ; magnesia, 

 G; sal ammoniac, 3'GO ; quick lime, T80; tartar, 9. 



The copper is first placed in a crucible in a suitable furnace, and fused, 

 the magnesia is then added slowly, then the sal ammoniac, lime and tartar 

 separately and in the form of powder. These are kept from the air, and well 

 stirred with the copper for twenty minutes, until the whole are incorporated 

 together. The zinc is then added in strips or fine pieces, thrust through the 

 crust on the top of the copper. The whole mass in then thoroughly stirred, 

 the crucible closed, and its contents kept in fusion for twenty-five minutes. 

 After this the crucible is opened, and skimmed very carefully to remove all 

 the dross. The alloy thus formed is poured out into dry sand moulds if re- 

 quired to be rolled; if not, it may be poured into iron moulds. When re- 

 melted in a blast furnace, it is rendered more applicable for ornamental 

 works of art. 



