^'IG. 231. Absorption-spectra. 



1, Oxyhaemoglobin (very weak solution) ; 2, Oxyhaemoglobin (weak solution) ; 3, Oxy 

 haemoglobin (strong solution); 4, Haemoglobin (reduced haemoglobin); 5, Carbon- 

 monoxide haemoglobin ; 6, Acid haematin ; 7, Acid haeinatin (ethereal extract); 8, Alkaline 

 haematin ; 9, Haemochromogen (reduced haematin); 10, Haematoporphyrin (acid solu- 

 tion); 11, Haematoporphyrin (alkaline solution). 



