These substances were analyzed after drying at 105° in vacuum 

 over phosphorus pentoxide. 



The recrystallized salt gave the following results : 



Found : C = 6.28 ; H = 1.28 ; P = 15.93 ; Ba = 42.18 ; H 2 = 11.81 

 per cent. 



The crystalline salt which separated from the aqueous solution 

 gave: 



C = 6.47; H = 1.23; P = 15.95; Ba = 42.77; H 2 = 12.62 per 

 cent. 



These substances are therefore nearly pure heptabarium inosite 

 hexaphosphate. 



Calculated for (CH^O^P^Ba, = 2267. 



C = 6.35; H=0.97; P= 16.40; Ba = 42.39 per cent. 



The water-soluble substance precipitated with alcohol gave the 

 following : 



Found : C = 8.58 ; H = 1.62 ; P = 15.86 ; Ba = 38.28 per cent. 



This substance was again treated with about 100 cc. of cold water, 

 the insoluble portion filtered off and the filtrate, after adding 1 gram 

 of barium chloride, precipitated with alcohol. After washing in dilute 

 alcohol, alcohol and ether and drying in vacuum over sulfuric acid 1.4 

 grams of a white, amorphous substance was obtained. For analysis 

 it was dried at 105° in vacuum over phosphorous pentoxide. 



Found: C = 8.08; H = 1.68; P= 15.64; Ba = 39.75 per cent. 



This water-soluble substance apparently represents a mixture of 

 the barium salts of penta- and tetraphosphoric acid esters of inosite. 



CONCERNING THE DECOMPOSITION PRODUCTS OF 



INOSITE HEXAPHOSPHORIC ACID AFTER DRYING 



AT 105° UNDER REDUCED PRESSURE 



The specimen of old inosite hexaphosphoric acid previously exam- 

 ined was used ; 12.8 grams (corresponding to 10 grams dry acid) was 

 dried at 105° for about 48 hours over sulfuric acid under slightly re- 

 duced pressure. It was then dissolved in about 200 cc. of cold water. 

 The solution was practically black in color and contained particles 

 of carbonized material. It was decolorized by shaking with animal 

 charcoal. The clear, colorless solution was then precipitated with 

 barium hydroxide to slight alkaline reaction, the precipitated filtered 

 and washed in water and reserved for examination. The filtrate and 

 washings were freed from barium with carbon dioxide and evaporated 

 on the water-bath to dryness. The residue was taken up in a small 

 amount of hot water and filtered. On adding a little alcohol a heavy, 

 voluminous, white, amorphous precipitate was produced. This was 



57 



