ABSORPTION SPECTRA OF THE ALKALOIDS. 
487 
Quinine. From Mr. David Howard. Plate 53, fig. 7. 
0'02 grm. in 20 cub. centims. of alcohol of sp. gr. 0'8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, strong to. 
3465 
4 
Continuous, strong to. 
3465 
3 
Continuous, strong to. 
3403 
Absorption band fi’om. 
34-03 to 3033 
Rays transmitted to. 
2995-5 
2 
Continuous, strong to. 
3403 
Absorption band from. 
3403 to 3033 
Rays transmitted very weakly to 
2980 
Absorption band, but weaker than 
former, from. 
2974 to 2854 
Rays transmitted very weakly to . 
2572 
1 
Continuous, strong to. 
3393 
*Eeeble, but not continuous to 
312.3 
Continuous, strong to . . . . . 
2936 
*Eeeble to. 
2880 
Continuous, weak to. 
2469 
Quinine Sulphate. From Mr. David Howard. Plate 54, fig. 1. 
0'02 grm. in 20 cub. centims. of alcohol of sp. gr. 0'8, and 5 cub. centims. of double 
normal sulphuric acid. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous to. 
3746 
Absorption band from. 
3746 to 2865 
Rays transmitted to. 
2747 
Spectrum ends at. 
2660 
4 
Continuous to. 
3746 
Absorption band from. 
3746 to 2875 
Spectrum ends at. 
2660 
3 
Continuous to. 
3691 
Absorption band from. 
3691 to 3028 
Spectrum ends at. 
2644 
2 
Continuous, strong to. 
3606 
Absorption band from. 
3606 to 3466 
Rays transmitted to. 
2632 
1 
Continuous, strong to. 
3606 
Weak, scarcely continuous to 
3465 
This may be called a faint absorption 
band. 
Continuous, strong to. 
2632 
Spectrum ends at. 
2515 
* At these points there are traces of absorption bands. 
3 R 2 
They may be said to be still there, but feeble. 
