COMPOUNDS OF HEMOGLOBIN. 



29 



15. Compounds of H&moglobin with ; Oxyhsemoglobin, 

 and Methsemoglobin, 



(1.) Oxyhaemoglobin (0 2 Hb) behaves as a weak acid, and occurs to 

 the extent of 8678 to 94*30 per cent, in dry red human corpuscles 

 (Jiidell). It is formed very readily whenever Hb comes into 

 contact with or atmospheric air. 1 gramme Hb unites with 

 1-6 to 1-8 cubic centimetres of at and 760 mm. Hg pressure. 

 Oxyhsemoglobin is a very loose chemical compound, and is slightly less 

 soluble than Hb ; its spectrum shows in the yellow and the green, two 

 dark absorption-bands (Hoppe-Seyler) whose length and breadth in a 

 0'18 per cent, solution are given in Fig. 11 (2). 



Bed. Orange. Yellow. 



, 



A a B C 



Green. 



Blue. 



Reduced 



Hamatm. 



70 80 Qo 100 110 



F 

 Fig. 11. 



Various spectra of haemoglobin and its compounds. 



