172 TYRO SINE. 



and decompose with hydrothion. The solution on 

 evaporation leaves amorphous taurocholic acid. 



3. Taurocholate of sodium is not precipitated by- 

 acids but by caustic potash. Its solution in water 

 froths like soap-lather. It is not precipitated by neu- 

 tral lead acetate. 



4. By boiling with hydrochloric acid it is decom- 

 posed, yielding taurine, cJioloidic acid, and dyslysine. 



5. By boiling with excess of caustic baryta it is also 

 decomposed, yielding taurine and cJwlic acid, which 

 latter remains in combination with the baryum. 



6. On fusion with caustic potash taurocholic acid 

 and taurocholates behave like taurine (3), forming 

 sulphides, which are decomposed by acids under evo- 

 lution of hydrothion. 



7. Determine the quantity of taurocholic acid by the 

 process Bile, 14. 



Trimethylamine, C 3 H 9 N. 1. Distil urine with lime; 

 saturate the alkaline distillate with sulphuric acid, 

 evaporate to dryness, and extract with absolute 

 alcohol. Trimethylamine sulphate if present dissolves, 

 and maybe purified by recrystallisation, and the trime- 

 thylarnine liberated by distillation with potash. 



2. To a little of the sulphate add calcium hydrate in 

 powder, and warm. Trimethylamine will be disen- 

 gaged, with a peculiar odour of bad fish. 



Tt/rosine, C 9 H n N0 3 . 1. Boil horn shavings with 

 twice their weight of dilute sulphuric acid (one part of 

 concentrated sulphuric acid and four parts of water) 



