64 POISONS : THEIR EFFECTS AND DETECTION. [§ 39. 
CURVES INDICATING THE POSITION OF ABSORPTION BANDS 
ON TREATING CERTAIN ALKALOIDS WITH REAGENTS. 
H G F bE D CB A fl G F bE D OB A 
NOTES TO CURVES INDICATING ABSORPTION BANDS. 
1. Strychnine, treated with sulphuric acid and potassic dichromate (violet). 
2. Brucine, treated with potassic nitrate and sulphuric acid (clear red). 
3. Quebrachine, treated with vanadium sulphate (dark blue). 
4. Quinine, Vogel’s reaction (red). 
5. Caffeine, Murexid reaction (violet-red). 
6. Delphinoidin, Froehde’s reagent (cherry-red). 
7. Veratrine, treated with sulphuric acid (straw-yellow). 
8. „ „ „ (cherry-red). 
9. ,, ,, „ (carmine-red). 
10. Veratrine, Furfurol reaction (blue-violet). 
11. Sabadillin, treated with sulphuric acid (red). 
12. Veratroidine, „ (brown-red). 
13. Jervine, Furforol reaction (blue). 
14. Sabadine „ ,, (blue). 
15. Sabadine, treated with sulphuric acid (cherry-red). 
16. Physostigmine „ „ (grass-green). 
17. Morphine, treated with Froehde’s reagent and sugar (dark green) 
18. Narcotine, treated with a mixture of sulphuric acid and nitric acid (30 drops of 
sulphuric to 1 drop of nitric), (red). 
19. Codeine, treated with Froehde’s reagent and sugar (dark violet). 
20. Papaverine, treated with Froehde’s reagent (green-blue). 
21. Sanguinarin, ,, „ ,, (violet-red). 
22. Chelidonin, „ sulphate of vanadium (dark green). 
23. Solanin, ,, sulphuric acid and allowed to stand 4 hours (brown-red). 
24. Digitalin, ,, Erdmann’s reagent (red). 
25. Aniline, „ sulphuric acid and potassic dichromato (blue). 
