HEMOGLOBIN 



153 



"haematin ; the other changes to red, and two bands are seen, one between D 

 and E, and the other nearly coinciding with E and b (fig. 57, spectrum 9). 

 The spectrum of alkaline haematin reappears for a short time after vigorous 

 shaking with air. 



7. Haematoporphyrin. — To some strong sulphuric acid in a test-tube add a 

 few drops of undiluted blood- and observe the spectrum of acid haemato- 



f la. 58. — The photographic spectnun of hsmoglobin and oxyLjemoglobin (Gamgee.) 



Fie. 59.— The photographic spectrum of oxyhtemoglobin and methsemoglobiiu (Gamgee.) 



porphyrin (iron-free haematin) (fig. 57, spectrum 10). Map out all the spectra 

 you see on a chart. 



8. The Photograpliic Spectrum. — Haemoglobin sjid its compounds also 

 show absorption bands in the ultra-violet portion of the spectrum. This 

 portion of the spectrum is not visible to the eye, but can be rendered visible 



