New York Agricultural Experiment Station. 341 



preparation of the free acid from the above amorphous 



barium salt. 



The acid was prepared from 3 grams of the barium salt in the 

 usual way, i. e. the barium was precipitated with slight excess of 

 sulphuric acid, filtered and the filtrate precipitated with copper 

 acetate. The copper precipitate was filtered and washed thoroughly 

 in water, suspended in water and decomposed with hydrogen sulphide, 

 filtered and the filtrate evaporated in vacuum at a temperature of 

 40° to 45° to a syrupy consistency and finally dried in vacuum 

 over sulphuric acid. The product was a thick, faintly amber-colored 

 syrup. For analysis it was dried at 105° in vacuum over phosphorus 

 pentoxide. It turned very dark in color. 



Found: C = 11.09; H = 3.04; P = 26.85 per ct. 



Both carbon and phosphorus are higher than required for phytic 

 acid, CgH 24 27 P6. 



Calculated: C = 10.08; H = 3.36; P = 26.05 per ct. 



PREPARATION OF THE SUBSTANCE FROM CORN AS A CRYSTALLINE 



BARIUM SALT. 



A larger quantity of corn meal was extracted with 0.2 per ct. 

 hydrochloric acid, the extract filtered and precipitated by adding 

 a concentrated solution of barium chloride. The precipitate was 

 then purified and crystallized in the manner described for cotton- 

 seed meal in the preceding article. After the substance had been 

 separated from dilute hydrochloric acid solutions twelve times 

 (eleven times in crystalline form) it was obtained as a beautiful 

 snow-white, bulky crystalline powder which weighed 49 grams. 

 The crystal form was identical with that of the barium salts from 

 cottonseed meal and oats, i. e. globular masses of microscopic needles. 

 The substance was free from chlorides and inorganic phosphate 

 and we were unable to detect any metals other than barium. 



For analysis it was dried at 105° in vacuum over phosphorus 

 pentoxide. 



0.4101 gram subst. gave 0.0607 gram H 2 and 0.0985 gram C0 2 . 

 0.1477 gram subst. gave 0.1035 gram BaS0 4 and 0.0860 gram 

 Mg 2 P 2 7 . 



Found: C = 6.55; H = 1.65; P = 16.23; Ba = 41.23 per ct. 



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

 dissolved in a small quantity of 3 per ct. hydrochloric acid; barium 

 hydroxide was carefully added until a slight permanent precipitate 

 remained; the solution was filtered and a concentrated solution of 

 2 grams barium chloride added. The perfectly clear solution was 

 allowed to stand at room temperature for about 2 days when the 



