Found: C = 20.03; H = 3.58; P = 8.S3; Ba = 25.55 per cent. 



The small quantity precluded recrystallization and we are there- 

 fore unable to state whether the substance was pure. The analytical 

 result indicates that it was a barium salt of inosite monophosphate 

 and agrees approximately with this formula : 



C 1B H 8S O„P,Ba 2 =10Sl. 



Calculated : C = 20.55 ; H = 3.33 ; P = 8.84 ; Ba = 26.16 per cent. 



Such a salt could be represented by the following formula : 



OH 



C 6 H,,O c -P^O 

 O 



\ 



Ba 



/ 



C e H M 0„— P = 

 ^O 



/ 



Ba 



O 

 QH,,0 6 -P=0 



EXAMINATION OF THE PRECIPITATE PRODUCED WITH 



BARIUM HYDROXIDE AFTER DRYING THE 



ABOVE ACID 



A portion of the barium precipitate was dried in vacuum over sul- 

 furic acid and then examined for total and inorganic phosphorus in 

 the same way as before : 



Found : Total phosphorus (by Neumann method) 9.98 per cent. 



Found : Inorganic phosphorus 7.46 per cent. 



As will be noticed from these figures, 74.76 per cent of the phos- 

 phorus was present as inorganic phosphoric acid. 



The substance was freed from inorganic phosphate by precipi- 

 tating four times with alcohol from 0.5 per cent, hydrochloric acid. 

 After finally drying in vacuum over sulfuric acid 3.2 grams of a snow- 

 white, amorphous powder were obtained. The substance was free 

 from chlorides and inorganic phosphate. 



It was shaken up with about 75 cc. of cold water in which the 

 greater portion dissolved ; 10 cc. of N/1 barium chloride was added 

 and allowed to stand for several hours ; the insoluble portion was then 



59 



