1912.] 



Measurement of Absorption Bands. 



133 



6*o • d»6 

 <? • 6 • 6»6 

 o • 6«6»6 

 6 • 6«6*6 

 6 6«6«6 

 • 6 6 



5000 6000 



Wave-length. 



Fig. 2.— Sheep's Blood, 1 cm. thick, o, apparent edges of bands ; •, mean wave-length. 



been made elsewhere* of the possession of symmetry by these bands, this is 

 of considerable theoretical importance, and is to be more fully investigated 

 at a future date. 



(2) The effect of alteration in intensity of the incident light on the 

 boundaries of the bands of 2 Hb is shown in the following table : — 



Table IV. — Effect of Changing Intensity of Incident Light on the Bands. 



Intensity. 



A. 



B. 



C. 



D. 



E. 



F. 



G. 



8 



5812 



5764 



5698 



5598 



5492 



5398 



5316 



4 



5823 



5766 



5698 



.5594 



5501 



5403 



5314 



2 



5833 



5764 



5692 



5595 



5500 



5404 



5302 



1 



5841 



5763 



5688 



5583 



5511 



5402 







5840 



5765 



5684 



5591 





5396 





1 

 4 



5852 



5765 





5588 





5402 





L 



8 



5856 



5766 





5596 





5391 





1 



16 



5868 



5765 





5592 





5393 





A. Yellow edge I 



B. Centre >of a-band. 



C. Green edge J 



D. Centre of unabsorbed area. 



E. Green edge • 



F. Centre 



G. Blue edge 



It will be noted that a decrease in the intensity of the light tends to make 

 the bands broader, whereas an increase makes them narrower. In this case 

 * ' Journ. Physiol.,' 1912, vol. 44, p. 8. 



