New York Agricultural Experiment Station. 367 



soluble in water and it was free from chlorides and inorganic phos- 

 phate. 



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

 pentoxide. 



Found: C = 39.22; H = 5.43; N = 14.26; amino N by the Van 

 Slyke method = 0.999; Ba = 10.43; organic phosphorus after decom- 

 posing by the Neumann method = 0.875; it also contained small 

 quantities of magnesium, potash and soda. 



preparation of the crude barium salt of the organic phos- 

 phorus COMPOUND. 



The insoluble precipitate obtained with barium hydroxide from 

 the 50 grams of the crude substance was again precipitated three 

 times with barium hydroxide from 0.5 per ct. hydrochloric acid 

 and then four times with alcohol from the same strength hydro- 

 chloric acid. The product was then a white amorphous powder 

 and it weighed after drying in vacuum over sulphuric acid 22 grams. 



A preliminary experiment showed that when this substance was 

 dissolved in a little 0.5 per ct. hydrochloric acid and then mixed 

 with a concentrated solution of barium chloride and allowed to stand 

 some crystalline precipitate separated. The whole of the above 

 barium salt was therefore dissolved in the least possible amount of 

 0.5 per ct. hydrochloric acid; 5 grams of barium chloride dissolved 

 in a little water was added and the whole allowed to stand for 24 

 hours. A heavy white crystalline powder had then separated. 

 This was filtered and washed several times in water and finally in 

 alcohol and ether and allowed to dry in the air. This crystalline 

 substance was found later to consist principally of barium oxalate. 

 It weighed 2.75 grams which is equal to 12.5 per ct. of the barium 

 salt used. 



The filtrate, after removing the above crystals, was precipitated 

 with alcohol, filtered, washed in dilute alcohol, alcohol and ether 

 and dried in vacuum over sulphuric acid. It was again dissolved 

 in the minimum quantity of 0.5 per ct. hydrochloric acid, mixed 

 with a solution of barium chloride and allowed to stand for 24 hours. 

 A small amount of a crystalline precipitate had separated which 

 was filtered off. The filtrate was again precipitated with alcohol, 

 filtered, washed and dried as before. The dry substance was again 

 dissolved in 0.5 per ct. hydrochloric acid, barium chloride added 

 and allowed to stand for 24 hours. The solution remained perfectly 

 clear and no precipitate had separated. The substance was then 

 precipitated with alcohol, filtered and washed, again dissolved in 

 0.5 per ct. hydrochloric acid and reprecipitated with alcohol. It 

 was finally filtered, washed in dilute alcohol, alcohol and ether and 

 dried in vacuum over sulphuric acid. The product was a snow- 

 white amorphous powder, free from chlorides and inorganic phos- 



