78 



A a B G D 



BILIRUBINE. 

 Eb F G 



HH' 



AaBC D 



Spectrum of Cholocyanine. 

 Eb F G 



HH' 



Spectrum of Cholocyanine dissolved in water. 







8. Treat some dry cholophaeine with fuming or 

 much concentrated sulphuric acid, and triturate in a 

 mortar ; let the green solution attract water from the 

 air, and then add more water. Several green products 

 insoluble in water will be formed. One of these, in- 

 soluble in alcohol, is cJiolothalline, C 9 H n N0 3 . Another, 

 soluble in alcohol, has the following spectrum : 



AaBC D 



Eb 



HIT 



Spectrum of soluble Cholotlialline. 



9. Expose some dry bilirubine to the vapours of 

 bromine, and observe that it immediately becomes 

 violet-brown. Exposed to the air this will deliquesce 

 and form a blue solution of hydriodate of dibromo- 



