Dr. Schunck on Rubian and its Products of Decomposition. 363 



The composition here given approaches that of the oxylizaric 

 acid of Debus, who obtained in analysing that substance as a 

 mean of his experiments in 100 parts, — 



Carbon 66-40 



Hydrogen 3-82 



Oxygen 29"78 



The baryta compound, prepared by precipitating the ammo- 

 niacal solution with chloride of barium, gave on analysis the 

 following results : — 



- 2605 grm., dried at 100° C. and burnt with chromate of 

 lead, gave 0'4640 carbonic acid and - 0740 water. 

 0-4055 grm. gave 0-1835 sulphate of baryta. 

 In 100 parts :— 



Carbon 48-57 



Hydrogen 3-15 



Oxygen 18-60 



Baryta 29-69 



The formula C 42 H 13 O 13 + 2BaO = 2(C 14 H 4 O 4 + BaO) + 

 C 14 H 5 O 5 requires in 100 parts — 



Carbon 48-27 



Hydrogen 2-49 



Oxygen 19-93 



Baryta 29-31 



The compound with oxide of copper gave the folio wing results: — 

 0*3680 grm., dried at 100° C. and burnt with chromate of 

 lead, gave 0-7050 carbonic acid and 0-1030 water. 

 0-4710 grm. gave 0-1200 oxide of copper. 

 These numbers correspond veiy nearly to the following com- 

 position : — 



Another specimen, prepared in exactly the same manner and 

 having the same appearance, gave a different composition. 

 0-4375 grm. gave 0-8910 carbonic acid and 0-1345 water. 

 0-5530 grm. gave 0-1080 oxide of copper. 

 This gives the following composition : — 



