\th Series, Vol. HI. 



Plate I. 



ABSORPTION SPECTRA of BLOOD (Oxyhemoglobin), 

 showing Variation in Spectra with different thicknesses of Absorbing Medium. 



•75 -70 -65 -60 



45 





a|b 



c 



1 v 



1 







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i G 



H 



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MEMOIRS AND PROCEEDINGS, MANCHESTER LIT. AND PHIL. SOC. 



