OP ARTS AND SCIENCES. 295 



Calculated for Found 



Pb(C4UClBrS04)2 . H,0. I. II. 



Pb 27.75 27.83 



HaO 2.41 2.72 



0.7187 grm. salt dried at 100° gave 0.3000 grm. PbSOi. 



Calculated for PbCC^HClBrSO^Ja. Found. 



Pb 28.39 28.52 



Potassic aa- Chhrhromfurfuran-pSulphonate, KC4HClBrS04. 



The potassium salt is very soluble in hot water, less soluble in cold 

 water. The hot concentrated solution solidifies on cooling, with the 

 separation of small shining anhydrous plates. 



I. 0.5801 grm. air-dried salt gave 0.1699 grm. KoS04. 

 II. 0.5479 grm. air-dried salt gave 0.1625 grm. K2SO4. 



Action of Chlorine. 



"We attempted to prepare aa-dichlorfurfuran-^-sulphonic acid by 

 the action of chlorine upon the salts of ;8-sulpho-8-chlorpyromucic acid. 

 We found, however, that the reaction in this case was not as simple as 

 that with bromine, in that the oxidation of the furfuran-sulphonic acid 

 began long before one molecule of chlorine had been added, and that 

 sulphofumaric acid and even sulphuric acid were formed before the 

 whole of the original sulphochlorpyromucic acid had disappeared. 

 While it was not difficult to isolate a salt which had substantially the 

 properties and the composition of a baric dichlorfurfuran sulphonate, 

 we were unable to prepare by any variation of the method a product 

 from which we could obtain perfectly satisfactory results. 



Action of Nitric Acid. 



We studied the action of nitric acid upon /8-sulpho-S-chlorpyromucic 

 acid only so far as to satisfy ourselves that no nitro-acid could be 

 formed in this way, and that sulphofumaric acid was the chief product 

 of the reaction. 



