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PRINCIPLES OF GENERAL PHYSIOLOGY 



1. 



A C 



FIG. 193. ABSORPTION SPECTRA OF HEMOGLOBIN. Photographed with grating spectrograph. 



A 1, Wave length scale. 



2-11, Series of dilutions of rabbit's blood, oxygenated. Dilutions range from 1 : 70 to 1 : 2,000. 

 The ultra-violet band is seen in the more dilute specimens. 

 Thickness of layer, 14 mm. 



Bl, Wave length scale. 



2, Normal blood, 1 : 70. 



3, The same reduced with ammonium sulphide. The delicate band in the orange is due to sulph- 



haemoglobin. 



4, Normal blood, 1 : 100. 



5, The same reduced. 



6, Normal blood, 1 : 150." 



7, The same reduced. 



C 1, Wave length scale. 



2, Normal blood, 1 : 200. 



3, Blood exposed to carbon monoxide and then acted upon by ammonium sulphide. No change in 



the bands. 

 The bright line spectra are those of a helium tube. 



(After Rest, Franz, und Heise.) 



