New York Agricultural Experiment Station. 161 



precipitates. The addition of alcohol also produces white 

 precipitates. 



The ordinary molybdate solution does not give any precipitate 

 in dilute solutions of the acid; in concentrated solutions a yellowish 

 white precipitate is obtained. On acidifying with nitric acid and 

 heating, the yehow phospho-molybdate is slowly precipitated. 



The aqueous solution of the acid is only incompletely precipitated 

 by magnesia mixture. A slight white-colored amorphous precipitate 

 is obtained but the addition of alcohol produces a voluminous white 

 precipitate. This product is, however, not a pure salt as shown by 

 the following results which were obtained on analysis of the dried 

 precipitate: 



Found Mg 11.29, N 2.40, P 16.45 per ct., which numbers do not 

 agree with any formula for a pure magnesium ammonium salt of 

 the above acid. 



A larger quantity of the barium salt was prepared by treating 25 

 grams of the substance with barium hydroxide and purifying the 

 barium salt in the same way as before, except that after precipitating 

 the dilute hydrochloric-acid solution with alcohol the mixture was 

 allowed to stand for several days. 



After drying at 125° the following results were obtained on analysis: 



C 12.05, H 2.46, P 13.83, Ba 32.19 per ct. 



C 11.85, H 2.32, P 13.82, Ba 32.08 per ct. 



Although the barium is found somewhat low this salt corresponds 

 to the penta-barium salt of the acid C20 H55 O49 P9. 



For C20 H45 O49 P9 Bas - 2035. 



Calculated C 11.79, H 2.21, P 13.71, Ba 33.76 per ct. 



The free acid prepared from this salt by the same method as before 

 gave the following results on analysis after previously drying at 130°. 



C 16.91, H 3.96, P 20.88 per ct. 



C 16.91, H 3.84. 



It appears then that the substance C25 Hes O45 P9 is very sensitive 

 to acids and that when it is kept in contact with even dilute acids 

 for any length of time the elements of one pentose, C5 Hio 0&, are 

 spht off. 



BRUCINE salt OF THE ACID, 

 C20 II55 O49 P9. 



While it was impossible to obtain any crystalline salts of the 

 above acid with inorganic bases it gave a crystalline brucine salt 

 of the formula C20 H55 O49 P9 (C23 H26 O4 N2) io+30 H2O. 



About one gram of the acid was dissolved in a small quantity of 

 water and brucine was then added until the solution showed a shght 

 alkahne reaction. After diluting the solution with 150 cc. alcohol 

 and 30 cc. chloroform, ether was added until a slight permanent 

 turbidity remained. On standing for several days it room tempera- 

 6 



