492 
PROFESSOR W. N. HARTLEY ON THE 
Codeine. From Dr. C. E. A. Wright. Plate 55, fig. 2. 
0'1 grm. in 20 cub. centims. of alcohol of sp. gr. 0'8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millras. 
5 
Continuous to. 
3008 
4 
Continuous to. 
2980 
8 
Continuous to. 
2980 
2 
Continuous, strong to. 
2980 
Absorption band from. 
2977 to 2613 
Rays transmitted at. 
2613 
1 
Continuous, strong- to. 
2977 
Absorption band from. 
2977 to 2747 
Rays transmitted to. 
2572 
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. 
2965 
4 
Continuous to. 
2965 
Absorption band . .. 
2965 to 2735 
Spectrum ends at. 
2556 
3 
Continuous to. 
2942 
Absorption band. 
2942 to 2798 
Spectrum ends at. 
2556 
2 
Continuous to. 
2942 
Absorpiion band. 
2942 to 2863 
Rays transmitted to. 
2556 
1 
Spectrum strong to. 
2942 
Rays transmitted are weak to end at . 
2556 
Codeine. From Messrs. T. and E. Smith and Co. Plate 55, fig. 3. 
0'2 grm. in 20 cub. centims. of alcohol of sp. gr. 0'8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengihs. 
millims. 
5 
Strong, continuous to. 
3008 
4 
Strong, continuous to. 
3008 
Very faint to. 
2980 
3 
Strong, continuous to ... 
3008 
Faint to. 
2980 
2 
Strong, continuous to . 
2980 
Absorption band. 
2964 to 2660 
Rays transmitted faintly to ... 
2613 
1 
Continuous, strong to . 
2980 
Absorption band .... 
2747 to 2572 
Continuous, strong’ to . 
transmitted 
2980 
Absorption band. 
2962 to 2747 
Rays transmitted to. 
2572 
