water until free from chlorides. It was again dissolved in 1 per cent, 

 hydrochloric acid, filtered, and the solution rendered neutral to litmus 

 with barium hydroxide. The precipitate was filtered and washed free 

 of chlorides with water and then in alcohol and ether and dried in 

 vacuum over sulfuric acid. The substance was a pure white, amor- 

 phous powder. On moist litmus paper it showed a very faint acid 

 reaction. It was free from nitrogen. 



For analysis it was dried at 100° in vacuum over phosphorus 

 pentoxide. 



0.2323 gm. substance gave 0.0370 gm. H,0 and 0.0758 gm. CO,,. 



0.2085 gm. substance gave 0.1668 gm. BaSO, and 0.0868 gm. 

 Mg 2 P 2 7 . 



Found: C=8.89; H=1.78; P=11.60; Ba=47.07 per cent. 



The substance was again dissolved in 1 per cent, hydrochloric acid 

 and the solution neutralized to l'tmus with barium hydroxide. It was 

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

 and dried in vacuum over sulfuric acid. 



It was analyzed after drying as before and the following results 

 obtained: 



0.3168 gm. substance gave 0.0481 gm. H 2 and 0.0972 gm. C0 2 . 



0.2366 gm. substance gave 0.1968 gm. BaSC) 4 and 0.0960 gm. 

 M? 2 P 2 7 . 



Found: C=8.36; H=1.69; P — 11.31; Ba=48.94 per cent. 



For the neutral barium salt of inosite triphosphate, 

 C H 9 O 1B P 3 Ba 3 =826. 



Calculated: C=8.71 ; H=1.08; P=11.25; Ba=49.88 per cent. 



In the two analyses reported above the carbon is somewhat low. 

 It must be noted, however, that these barium salts burned with ex- 

 treme difficulty. Traces of carbon remained after prolonged heating 

 in a current of oxygen. The residues were mixed with fine copper 

 oxide and re-burned when one or two milligrams of carbon dioxide 

 were obtained, but we believe that the combustion even under these 

 conditions was incomplete. 



PREPARATION OF THE ACID BARIUM SALT 



The above neutral barium salt was dissolved in the minimum 

 quantity of 1 per cent, hydrochloric acid, the solution was filtered, and 

 precipitated by adding about an equal volume of alcohol. The result- 

 ing precipitate was filtered, washed free of chlorides with dilute alco- 

 hol and then in absolute alcohol and ether and dried in vacuum over 

 sulfuric acid. The substance was then a pure white, amorphous 

 powder which showed a strong acid reaction on moist litmus paper. 



It was analyzed after drying at 105 in vacuum over phosphorus 

 pentoxide. 



