barium hydroxide was examined as follows : It was rubbed up with 

 about 400 cc. of 0.5 per cent, hydrochloric acid and brought into solu- 

 tion by the careful addition of dilute hydrochloric acid. After filter- 

 ing it was precipitated by adding an equal volume of alcohol. The 

 precipitate was filtered, washed in dilute alcohol, dissolved in 0.5 per 

 cent, hydrochloric acid and reprecipitated by barium hydroxide. The 

 substance was then precipitated twice from 0.5 per cent, hydrochloric 

 acid with alcohol, finally filtered, washed in dilute alcohol, alcohol 

 and ether and dried in vacuum over sulfuric acid. A white, amor- 

 phous powder was obtained which weighed 14 grams. It was free 

 from chlorides and inorganic phosphate. After drying at 105° in 

 vacuum over phosphorus pentoxide the following results were ob- 

 tained : 



Found : C = 7.83 ; H = 1.46 ; P = 16.72 ; Ba = 36.96 per cent. 



The carbon found is much too high for a pure barium inosite 

 hexaphosphate. 



PREPARATION OF CRYSTALLIZED BARIUM INOSITE HEXA- 

 PHOSPHATE FROM THE ABOVE AMORPHOUS 

 BARIUM SALT 



The substance was rubbed up in a mortar with about 150 cc. of 

 cold water and allowed to stand for several hours. The insoluble por- 

 tion was changed slowly into a semi-crystalline precipitate. It was 

 filtered and washed in water and then recrystallized as follows : It 

 was dissolved in a small quantity of about 3 per cent, hydrochloric 

 acid, the free acid nearly neutralized with barium hydroxide ; a con- 

 centrated solution of 10 grams of barium chloride was added, the solu- 

 tion filtered and alcohol added gradually with constant shaking until 

 a slight permanent cloudiness was produced. On standing the sub- 

 stance crystallized slowly in the usual crystal form ; i. e., in globular 

 masses of microscopic needles. After two days the crystals were fil- 

 tered off, washed free of chlorides in water and then in alcohol and 

 ether and dried in the air. Yield, 4.5 grams. The substance gave no 

 reaction with ammonium molybdate. 



A further quantity of the same-shaped crystals was obtained 

 from the aqueous solution containing the water-soluble portion of the 

 amorphous salt by adding to it 2.5 grams barium chloride and allowing 

 to stand over night. The balance of the water-soluble portion of the 

 substance was recovered by precipitating with an equal volume of 

 alcohol. The resulting precipitate was filtered, washed free of chlorides 

 with dilute alcohol, alcohol and ether and dried in vacuum over sul- 

 furic acid. Yield, 4.1 grams. 



5C 



