New York Agricultural Experiment Station. 325 



alcohol and ether and dried in vacuum over sulphuric acid. It 

 was then a voluminous snow-white crystalline powder. 



The dry substance was again dissolved in dilute hydrochloric 

 acid, the free acid nearly neutralized with barium hydroxide and the 

 solution filtered and allowed to stand over night. The substance 

 soon began to crystallize. Under the microscope it appeared 

 perfectly homogeneous and consisted as before of globular masses 

 of microscopic needles. The substance was filtered, washed free 

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

 vacuum over sulphuric acid. The dry, snow-white, crystalline 

 powder weighed 69 grams. 



Qualitative analysis failed to reveal any heavy metals other than 

 barium and from 0.5 gram of the salt no weighable residue of alkali 

 was obtained. It gave no reaction with ammonium molybdate in 

 nitric acid solution. It was free from sulphur and nitrogen. 



It was analyzed after drying at 105° in vacuum over phosphorus 

 pentoxide. 



0.4641 gram subst. gave 0.0556 gram H 2 and 0.1125 gram C0 2 . 

 0.1982 gram subst. gave 0.1333 gram BaS0 4 and 0.1203 gram 



Mg 2 P 2 7 . 



Found: C = 6.61; H = 1.34; P = 16.91; Ba = 39.57 per ct. 



For tribarium inosite hexaphosphate: 



C 6 H 12 24 P 6 Ba3 = 1066. 



Calculated: C = 6.75; H = 1.12; P = 17.44; Ba = 38.65 per ct. 



A portion of this salt was recrystallized as follows: 5 grams were 

 dissolved in a small quantity of 5-per-ct. hydrochloric acid and the 

 free acid nearly neutralized with barium hydroxide, the solution 

 was then filtered and 2 grams of barium chloride dissolved in a 

 little water added 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 remained. 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 sulphuric 

 acid. The dilute nitric acid solution of the substance gave no 

 reaction with ammonium molybdate. The snow-white crystalline 

 powder was analyzed after drying at 105° in vacuum over phos- 

 phorus pentoxide. 



0.3588 gram subst. gave 0.0464 gram H 2 and 0.0867 gram C0 2 . 

 0.1726 gram subst. gave 0.1138 gram BaS0 4 and 0.1058 gram 

 Mg 2 P 2 7 . 



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



