Absorption Spectra. 



PLATE II. 



Reduced Alkali 

 Haematin or 

 Haemochromogen. 



Acid Haematin in 

 ethereal solution. 



14 



Acid Haemato- 

 porphyrin. 



Alkaline 



Haematopor- 

 phyrln. 



Urobilin or Hydro- 

 bilirubin in acid 

 solution. 



Urobilin or Hydro* 

 bilirubin -in alkaline 

 solution after the 

 addition of zinc 

 chloride solution. 



Billcyanin or 

 Cholecyanin in 

 alkaline solution. 



