368 Journal of the Asiatic Society of Bengal. [November, 1912.] 
the theoretical value for the formula 4 Cu,8,0, 4 Na.S,0. 
5 Cu,C, 7C, H, being— Pe ke 
Na = 7:33, Cu=45:2, S= 20-4, 
When the substance is decomposed in vacuum it gives off a 
large amount of SO, and CO, with an admixture of a little 
acetylene. 
When the substance is treated with an alkali it undergoes 
a modification, an insoluble brown-coloured substance being 
the result. 
Th hor is now engaged in studying its properties and 
the analysis of the gases obtained by explosion. 
NLR I IOI RP ge 
