COMPOUNDS OF HAEMOGLOBIN. 



29 



15, Compounds of Haemoglobin with 0; Oxytomoglobin, 



and Mettomoglobin. 



(1.) Oxyhasmoglobin (0 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. 

 Oxyhaemoglobin 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). 



Yellow. 



Green. 



Blue. 



Red. Orange. 



Illl ILIUIU I II.LI ILLI Ullllililllll 



5o bo 70 80 oo 100 tio 



A a B C 



o = 



Eaiiiofrlobin 



0,8 7, 



O = 



Hemoglobin 

 0-18 7, 



Ca rbonic 



Oxide 

 Hamoglobin. 



Reduced 

 Hamoglobin. 



Hamatin in 



Alcohol, with 



Sulphuric 



Acid. 



Hamatin in 



an Alkaline 



Solution. 



Reduced 

 Hamatin. 



Various spectra of haemoglobin and its compounds. 



