PLATE IV. 



ABSORPTION-SPECTRA . 



1. Oxyhsemoglobin. 



2. Haemoglobin. 



3. CO-hsBmoglobin and CO-hsemochromogen 



4. Methsemoglobin, alkaline. 



5. Hoematoporphyrin, acid. 



6. Hsematoporphyrin, alkaline. 



7. Hsemochromogen, alkaline. 



8. Hsematin, acid. 



9. Hsematin, alkaline. 



10. Sulphur metheemoglobin. 



11. Methsemoglobin, neutral or faintly acid. 



12. Pettenkofer's test for biliary acids. 



