48 



HEMOGLOBIN 



If therefore the carboxy- and oxyhaemoglobin are present in equal 

 amounts, so that 



[COHb] _ 

 [O^Hb] - ^' 



the concentration of Og will be 540 times that of carbon monoxide. 



550 



500 



450 



400 



350- 



300 



250 



200 



150 



100 



Horse 

 Man 



Horse 

 Fowl 



Rabbit 

 Rabbit 



J L 



J I L 



48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 

 Fig. 11. Ordinate = K (see text); abscissa = span in Angstrom units. 



The value of K is found to be specific, even individual; not only 

 is it different in the blood of one species from what it is in the blood 

 of another, but it differs even between individuals of the same species. 



The same was seen to be true of another relation of haemoglobin 

 to carbon monoxide and oxygen respectively — namely, the shifting of 

 the a-band in the spectrum. We are now faced with a remarkable 

 relation. The greater the extent by which the a-band of oxyhaemo- 



