LECITHINE. 141 



while the filtrate contains choline and a part of the 

 glycerophosphoric acid. Eemove free baryta by 

 carbonic anhydride, and extract the residue with 

 alcohol : choline hydrochlorate dissolves, and may be 

 precipitated by platinic chloride, and the yellow flaky 

 precipitate washed with alcohol. By crystallisation 

 from water it is obtained in yellow prisms or tables, 

 closely resembling the choline-platinic chloride prepared 

 from bile. On evaporation the watery solution gives 

 the same crystals down to the last drop. It contains 

 31*68% of platinum, pointing to the formula 2 (C 5 H 14 

 NO 01) Pt01 4 , which is the same as that of the com- 

 pound from bile. 



7. To establish the presence of glycerophosphoric 

 acid, the residue insoluble in alcohol is redissolved in 

 water, freed from baryum by sulphuric acid, saturated 

 with calcium carbonate, the sulphuric acid exactly 

 precipitated by baryum chloride, and the filtrate 

 evaporated down ; the crystalline calcium glycero- 

 phosphate which separates, after washing with alcohol 

 and drying at 100, gives results corresponding with 

 the formula C 3 H 7 CaP0 6 . 



8. The baryum salt, insoluble in water, is decom- 

 posed by boiling with hydrochloric acid, when a fluid 

 stratum, nearly solid on cooling, separates, and may 

 be washed with water. The liquid contains much 

 baryum chloride, also glycerophosphoric acid, partly 

 decomposed into phosphoric acid and glycerine during 

 the boiling. 



9. The fatty acids dissolve in ammonia and are 

 precipitated as lead salts by lead acetate. From the 



