1 14 Organic Phosphorus Compounds of Wheat-Bran [March, 



manner. The resulting precipitate weighed, after drying, 12.8 gm. 

 It was dried for analysis at 105° C, in vacuum, over phosphorus 

 pentoxid. Analytic data: 



0.2050 gm. gave 0.1261 gm. BaSOi. 

 0.2019 gm- gave 0.1186 gm. MgoPjOj. 

 0.3348 gm. gave 0.0834 gm. CO, and 0.0555 gm. HoO. 

 Found: Ba, 36.20%; P, 16.37%; Q 6.79%; H, 1.85%. 



This method of preparation does not seem to replace entirely the 

 bases originally present for, on fusing the salt with potassium hy- 

 droxid and potassium nitrate for the determination of phosphorus, 

 a faint trace of green was produced, showing the presence of a trace 

 of manganese, which was present in somewhat greater quantity in 

 the original alcohoHc precipitate. 



Preparation of the barium salt by the copper acetate method. 

 Tv/elve gm. of the alcohoHc precipitate were dissolved in water, a 

 few drops of hydrochloric acid sol. added, and then an excess of a 

 conc. sol. of copper acetate. The conversion of the resulting copper 

 salt to the barium salt was accomplished by the procedure described 

 previously for this method. The product free from phosphates, 

 weighed 12.2 gm. It was dried for analysis at 105° C, in vacuum, 

 over phosphorus pentoxid. Analytic data : 



0.2333 gm. gave 0.1418 gm. BaSO«. 

 0.2042 gm. gave 0.1160 gm. MgoPjO;. 

 0.3342 gm. gave 0.0862 gm. CO, and 0.0497 gm. H^O. 

 Found: Ba, 36.90%; P, 16.32%; C, 7.03%; H, 1.66%. 



The material was free from manganese, and probably this 

 method insures a more thorough Separation of the bases than the 

 former method. 



Purification of the barium salt by water extraction. Ten gm. 

 of this material were extracted with five successive 25 cc. vol. of 

 water, being rubbed up thoroughly in a mortar with each portion. 

 The final extract gave only a cloudiness with alcohol. The united 

 extracts were treated with 3 vol. of alcohol and the precipitate col- 

 lected, washed with alcohol and ether, and dried. Weight : 4 gm. 

 It was dried for analysis at 105° C, in vacuum, over phosphorus 

 pentoxid. Analytic data : 



