ABSORPTION SPECTRA OF THE ALKALOIDS. 
493 
The original solution diluted to 5 times its original volume = 1 in 1000. 
Thickness of 
layer of liquid. 
Descrip'ion of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous to. 
2976 
Absorption band. 
2962 to 2747 
Rajs transmitted to. 
2613 
4 
Continuous to. 
2976 
Absorption band. 
2976 to 2747 
Rays transmitted to. 
2570 
3 
Continuous to. 
2976 
Absorption band. 
2976 to 2747 
Rays transmitted to. 
2570 
2 
Continuous to. 
2976 
Absorption band. 
2976 to 2740 
Rays faintly transmitted to ... 
2740 
Very faint at. 
2568 
1 
Continuous to. 
2875 
Spectrum ends at . •. 
2542 
Diacetyl-Codeine. From Dr. C. R. A. Wright. Plate 55, fig. 4. 
0’2 grin, in 20 cub. centims. of alcohol of sp. gr. 0'8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5-4-3 
2 
Continuous, strong in all three cases to 
Continuous to. 
Absorption band. 
Rays transmitted to. 
2976 
2947 
2947 to 2613 
2572 
The original solution was diluted to 5 times its original volume = 1 in 1000. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, strong to. 
2976 
Absorption band. 
2976 to 2609 
Rays transmitted to. 
2568 
4 
Continuous, strong to. 
2942 
Absorption band. 
2942 to 2740 
Rays transmitted to. 
2568 
3 
Continuous, strong to. 
2942 
Absorption band ........ 
2942 to 2740 
Rays transmitted to. 
2556 
2 
Continuous to. 
2556 
Rays transmitted at. 
2542 
1 
The same to. 
2542 
Rays transmitted feebly to ... . 
2210 
3 s 
MDCCCLXXXV. 
