148 Report of Departmejs-t oe Ani^lal Industry of the 



acid and finally dried in vacuum over sulphuric acid and potassium 

 hydroxide until it was of a thick syrupy consistency. The product 

 obtained v/as of the same appearance as phytic acid or the tetra- 

 phosphoric ester, viz.: a thick, light amber colored liquid. After 

 drying at 105° the substance was analyzed. 



0.1709 gm. subst. gave 0.0552 gm. H2O and 0.0892 gm. CO2. 

 0.1739 gm. subst. gave 0.1517 gm. Mg2P207. 



For C6H6(OH)402 [P20.3(OH)3]2 = 500 

 Calculated C 14.40: H 3.20: P 24.80 per ct. 

 Found C 14.23: H 3.61: P 24.31 per ct. 



PROPERTIES OF THE FREE DIPYROPHOSPHORIC ESTER. 



The concentrated aqueous solution is a thick, light amber colored 

 syrup. On longer drying over sulphuric acid it becomes a hard and 

 brittle hygroscopic mass. 



i The aqueous solution is of strong acid reaction and sharp acid 

 taste. 



With barium chloride no precipitate is produced either in the 

 cold or on heating; alcohol or ammonia produces a white precipitate 

 in this solution. 



Calcium chloride gives no precipitate even on heating but alcohol 

 causes in this solution a voluminous flocculent precipitate. 



Calcium acetate produces at once a white precipitate sparingly 

 soluble in acetic but readily soluble in mineral acids. 



Magnesium acetate gives a white precipitate readily soluble in 

 acids. 



Ferric chloride gives a white or faintly yellowish precipitate very 

 sparingly soluble in acids. 



Barium acetate gives a white precipitate sparingly soluble in acetic 

 acid but readily soluble in dilute hydrochloric or nitric acids. 



Dilute silver nitrate does not cause a precipitate but concentrated 

 silver nitrate gives a white precipitate. 



With ordinary molybdate solution no precipitate is produced but 

 neutral molybdate gives a white precipitate which slowly turns 

 yellowish in color. On drying at 105° the substance turns very dark 

 in color. 



INOSITE FROM DI-PYROPHOSPHORIC ESTER. 



The free ester, 0.65 gm., was heated with 20 cc. 5/N sulphuric 

 acid in sealed tube to 150° for about three hours. The inosite was 

 isolated by the usual method and crystallized from dilute alcohol 

 after addition of ether. After recrystaUizing from hot dilute alcohol, 

 adding ether and allowing to stand several hours in the cold, the sub- 

 stance was obtained in small colorless crystals free from water of 

 crystallization: Yield 0.18 gm. or 75 per ct. of the theory. The 



