48G 
PROFESSOR W. N. HARTLEY ON THE 
No. 5. Aconitine. Aconitine of uncertain source. 
0'1 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 to. 
2812 
Spectrum faint, but not continuous, 
extends to. 
2568 
4 
Continuous to. 
2812 
Spectrum extends to. 
2568 
3 
Continuous to. 
2568 
2 
Continuous to. 
2542 
i 
Continuous to. 
2472-5 
0'i grm. in 100 cub. centims. of alcohol of sp. gr. 0*8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
W ave-lengths. 
millims. 
5 
Continuous to. 
2472-5 
4 
Continuous to. 
2418 
3 
Same as last. 
2 
Continuous to. 
2418 
i 
Continuous to. 
2387 
Spectrum extends to. 
2145-9 
Of these specimens, the spectra of which have been described, only two exhibit 
absorption bands. Curves have been drawn of these. 
Morson’s preparation, the crystals of which were one and even two millimetres 
in length, was found to absorb the rays at two points, the two absorptions being 
equally strong. The measurements and descriptions of the transmitted spectra are 
here given, together with the curves. 
It is noticeable that the most active aconitines are those with strongest absorption 
bands ; and of the commercial samples scarcely two yield the same absorption spectra. 
The variations in the curves indicate that not only may there be considerable 
differences in their composition, but also in their chemical constitution. 
