and the solution allowed to stand. The substance separated slowly in 

 the usual crystal form. After two days it was filtered, washed free of 

 chlorides with water, again dissolved in the dilute hydrochloric acid, the 

 solution filtered and alcohol added gradually until a slight cloudiness re- 

 mained. After standing for 24 hours at room temperature the substance 

 had crystallized in the usual form. It was filtered, washed free of 

 chlorides in dilute alcohol and then in alcohol and ether, and dried in 

 vacuum over sulfuric acid. The dilute nitric acid solution of the sub- 

 stance gave no reaction with ammonium molybdate. The snow-white 

 crystalline powder was analyzed after drying at 105° in vacuum over 

 phosphorus pentoxide. 



0.3588 gram substance gave 0.0464 gram FLO and 0.0867 g ram CO.,. 



0.1726 gram substance 0.1138 gram BaSC) 4 and 0.1058 gram 

 Mg 2 P 2 0, 



Found: C = 6.59; H=1.44; P= 17.08; Ba = 38.79 per cent. 



Another portion of the substance was re-crystallized as follows : 

 2 grams were d'ssolved in a small amount of the dilute hydrochloric acid, 

 barium hydroxide added, with constant shaking, until a faint permanent 

 precipitate remained, and the solution filtered. The filtrate was then 

 heated to boiling and allowed to stand for a few minutes. As the 

 temperature rose the solution began to turn cloudy and finally a heavy 

 precipitate separated which appeared to be amorphous at first but it 

 soon changed into the same crystal form as previously described. This 

 was filtered and washed free of chlorides in boiling water and then in 

 alcohol and ether and allowed to dry in the air. The dry substance 

 weighed 1.6 grams. The snow-white, crystalline powder was free from 

 inorganic phosphate. It was analyzed after drying at 105° in vacuum 

 over phosphorus pentoxide. 



0.4695 gram substance lost 0.0443 gram H 2 0. 



0.4252 gram substance gave 0.0423 gram H 2 and 0.0981 gram CO,. 



0.1238 gram substance gave 0.0885 gram BaS0 4 and 0.0735 gram 

 Mg 2 P 2 7 . 



Found: C = 6.29; H = l.ll; P= 16.54; Ba = 42.06; H 2 9.43 

 per cent. 



For heptabarium inosite hexaphosphate (C H 11 O 24 P c ) 2 Ba 7 = 2267 



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



For 14 H,0 calculated, 10.00 per cent. 



Still another portion of the substance was re-crystallized in the fol- 

 lowing manner : 2 grams were dissolved in the dilute hydrochloric acid 

 and then nearly neutralized with barium hydroxide as before. The 

 solution was filtered and 10 cc. N/1 barium chloride added and allowed 

 to stand over night. The substance had then separated as a heavy cry- 

 stalline powder of the same form as before except that the individual 



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