480 
PROFESSOR W. N. HARTLEY ON THE 
the same. Jt is as well to mention here that the whole of this work was executed in 
1882, some of it even at an earlier date, and curves were plotted according to the 
method described in the paper in the Phil. Trans., Yol. 170, p. 257, but two years 
subsequently the work was repeated, after the modifications in the method of 
working had been introduced. 
English Aconitine. From Messrs. T. and H. Smith and Co., of Edinburgh 
and London. Plate 53, fig. 2. 
0’2 grm. in 40 cub. centims. of alcohol of (P8 sp. gr. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
miliims. 
5 
Continuous, strong. 
3171 
A 
■ Continuous, strong. 
3171 
Faint. 
3138 
3 
Strong. 
3131 
Weak. 
3008 
2 
Continuous, strong. 
3128 
W eak. 
3008 
Absorption band. 
3008 to 2747 
Rays transmitted, faint. 
. . 
Spectrum ends at. 
2573 
1 
Continuous, strong. 
2978 
Absorption band. 
2978 to 2872 
Rays transmitted, weak, to ... 
2573 
Spectrum, faint, end at. 
2547 
0’02 grm. in 20 cub. centims. of alcohol of 0‘8 sp. gr. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
miliims. 
5 
Continuous to. 
3020 
Feeble to. 
2995 
Absorption band. 
2995 to 2735 
Spectrum ends at. 
2556 
4 
Continuous, strong, to. 
2965 
Absorption band. 
2965 to 2863 | 
Spectrum ends at. 
2556 
3 
Spectrum continuous to . . . . . 
2556 
Very feeble to . . 
2518 
2 
Spectrum ends at. 
2466 
1 
Fairly strong, continuous spectrum to . 
2466 
Spectrum ends at. 
2255 
