ABSORPTION SPECTRA OP THE ALKALOIDS. 
491 
Tetr acetyl-Morphine. From Dr. C. R A. Wright. Plate 55, fig. 1. 
0‘1 grm. in 20 cub. centims. of alcohol of sp. gr. 0'8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millime. 
5 
Continuous to. 
2949 
4 
Continuous to. 
2949 
3 
Continuous to. 
2926 
Absorption band from. 
2926 to 2572 
Rajs transmitted very faintly 
2572 
2 
Continuous to. 
2902 
Absorption band from. 
2902 to 2611 
Rajs transmitted faintly to ... 
2547 
1 
Continuous to. 
2864 
Absorption band from. 
2864 to 2745 
Rays transmitted to. 
2544 
Should there appear to be any discrepancy between the measurements of absorption 
bands seen in the spectra of strong and weak solutions of the same substance which 
might be expected to give the same readings on the scale, they may be accounted for 
by the fact that two series of photographs were taken by different persons and the 
measurements made and recorded by different observers, the later observations being 
made after the lapse of several months. In no case have the differences between any 
two sets of measurements been sufficiently great to affect the curves. 
0‘2 grm. in 200 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 
Absorption band. 
2964 to 2601 
Spectrum ends at. 
2556-5 
4 
Continuous to. 
2821-5 
Absorption band. 
2821 to 2735 
Spectrum ends at. 
2535 - 5 
3 
Rays continuous to. 
2821-5 
Rays transmitted feebly to .... 
2593 
A little stronger to. 
2556"5 
Very feebly transmitted to where 
spectrum ends at. 
2482 
2 
Spectrum ends at ....... 
2387 
1 
Spectrum ends at. 
2302-3 
