10 JOURNAIv OF THE 



Cu+H„SO,+02 = CuSO,4-H202, 

 and CuH.O.^CuO + H^O. 



I could detect no oxyg-en in the g-ases given off when 

 the experiments were carried out in an inert atmos- 

 phere. Nor could I detect hydrogen dioxide. Traube 

 himself states that no "active" oxygen was liberated 

 in the reaction because carbon monoxide was not oxidi- 

 zed to carbon dioxide. Pickering^ suggests that the 

 sulphide formed is "oxidized at the time of its appear- 

 ance by the oxygen which w^ould be liberated at the 

 surface of that portion of the copper which is immersed 

 in the acid, since the whole arrangement would form a 

 galvanic cell consisting of a metal, a liquid, and a gas." 



University of North Carolina. 



SOMK OF THE PROPERTIES OP CALCIUM 

 CARBIDE. 



BY F. P. VENABLE AND THOMAS CLARKE. 



The calcium carbide used was prepared by the Wil- 

 son Aluminum Conipan}^ In this preparation, lime is 

 mixed with some form of carbon, as coal-tar; the mass 

 is then heated, with stirring, until a thorough mixture 

 is obtained. The proportions are so arranged that the 

 mass becomes dry and hard on cooling. This mass, in 

 lumps, is then placed in the electric furnace. In a very 

 short time after the turning on of the current, the pro- 

 cess is complete. The molten mass can be run out of 

 the crucible or it may be removed after cooling. On 

 examination, it is easy to see that there is more or less 

 carbon unchanged, or rather converted into the graph- 



