The results of the completed investigation of the crystal structure of di- n -propylmonocyanogold make it possible to suggest constitutions for the products of its decomposition by long standing at the ordinary temperature or by heat which are probably more correct than those already advanced (Gibson 1935, 1938). These decomposition products are “di- n -propyldicyanodigold” and aurous cyanide. Di- n -propyldicyanodigold, an auric-aurous compound, produced by loss of half the n -propyl radicals from di- n -propylmonocyanogold is insoluble in water and all organic solvents and no information regarding its molecular weight is available. It was originally proposed that its structure might be that indicated (I) based on the suggested structure of di- n -propylmonocyanogold which has now been shown to be correct.