Frontispiece. 



Pl.ATE 



Solar spectrum with Fraunhofer lines. 2. Absorption spectrum of a concentrated solution of oxyhse 



globin; all the light is absorbed except in the red and orange. "•. Absorption spectrum of a les> concentri 



solution of oxyhemoglobin, i. Absorption spectrum of a dilute solution of oxyhemoglobin, showing tin 



characteristic bands. •">. Absorption spectrum of a very dilute solution of oxyhsemoglobin, showing only 



6 Absorption spectrum of a dilute solution of reduced haemoglobin, showing the characteristic .-' 



ed with spectrum 4). 7. Absorption Bpectrum of a dilute solution of carbon-monoi 



haemoglobin (to be compared with spectrum I). 8. Absorption spectrum of metheemoglobin. 9. Absoi H 



spectrum of acid h tlcoholic solution). 10. Absorption spectrum of alkaline haematin (alcoholic - 



odifled from MacMunn, Thi Specb-oscopt in Medicine). 



