54 COLOURING MATTER OF BLOOD. 



7. CO-ll86IIlOglobill. Blood which has been acted upon by carbonic 

 oxide has a peculiar cherry-red colour. The two absorption bands have nearly 

 the same position as those of Oxy-haemoglobin, but no change is produced 

 when the liquid is treated with reducing agents, as in 4. 



