342 Repobt of the Department of Chemistry of the 



substance separated slowly in the usual form. It was filtered, 

 washed free of chlorides with water and then in alcohol and ether 

 and dried in the air; yield 4.5 grams. The substance gave no reaction 

 with ammonium molybdate. 



It was analyzed after drying at 105° in vacuum over phosphorus 

 pentoxide. 



0.4770 gram subst. lost 0.0561 gram H 2 0. 

 0.1767 gram subst. lost 0.0209 gram H 2 0. 



0.4209 gram subst, gave 0.0491 gram H 2 and 0.0931 gram C0 2 . 

 0.3616 gram subst. gave 0.0427 gram H 2 and 0.0832 gram C0 2 . 

 0.1553 gram subst. gave 0.1110 gram BaS0 4 and 0.0907 gram 

 Mg 2 P 2 7 . 



Found: I. C = 6.03; H = 1.30; P = 16.28; Ba = 42.06 per ct. 

 II. C = 6.27; H = 1.32; 



H 2 = 11.76 and 11.82 per ct. 



For heptabarium inosite hexaphosphate (CeHnO^Pe^Bav = 2267. 



Calculated: C = 6.35; H = 0.97; P = 16.40; Ba = 42.39 per ct 

 For 16 H 2 calculated: 11.27 per ct. 



This recrystallized salt was again recrystallized as follows: it 

 was dissolved in a small quantity of 3 per ct. hydrochloric acid, 

 filtered and diluted with a small quantity of water. Alcohol was 

 then added until a faint permanent cloudiness remained. On 

 standing at room temperature the substance soon began to crystallize 

 in the usual form except that the crystals were much smaller. After 

 standing over night it was filtered, washed in dilute alcohol, alcohol 

 and ether and dried in vacuum over sulphuric acid. The product 

 was a snow-white, fine crystalline powder. It gave no reaction 

 for chlorides and none for inorganic phosphate. It was analyzed 

 after drying at 105° in vacuum over phosphorus pentoxide. 



0.3719 gram subst. gave 0.0465 gram H 2 and 0.0887 gram C0 2 . 

 0.1780 gram subst. gave 0.1187 gram BaS0 4 and 0.1091 gram 

 Mg 2 P 2 7 . 



Found: C = 6.50; H = 1.40; P = 17.08; Ba = 39.14 per ct. 



For tribarium inosite hexaphosphate, CeHioO^PeBaa = 1066. 



Calculated: C = 6.75; H = 1.12; P = 17.44; Ba = 38.65 per ct. 



preparation of the free acid. 



The acid was prepared in the usual way from about 4 grams of 

 the crystalline barium salt. After drying in vacuum over sulphuric 

 acid it was obtained as a thick, very faintly amber-colored syrup. 

 In appearance and reactions it corresponded exactly with the acids 



