ABSORPTION SPECTRA OF THE ALKALOIDS. 
509 
Pipeline. From T. and H. Smith and Co. Plate 56, fig. 3. 
O’l grm. in 20 cnb. centims. of alcohol of sp. gr. 0'8. (1 in 200 cub. centims.) 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, fairly strong to ... 
4061 
4 
Continuous, fairly strong to ... 
4061 
Continuous, fairly weak to .... 
4028 
3 
Continuous, strong to. 
4028 
Continuous, faint to. 
4000 
2 
Continuous, strong to. 
4000 
1 
Continuous, strong to. 
4000 
Continuous, weak to. 
3952 
This solution was kept twelve months before the next series of photographs was 
taken. 
The following measurements are the more exact, though there is but little difference 
between them. 
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, strong to. 
3982 
4 
Continuous, strong to. 
3982 
3 
Continuous, strong to ..... 
3982 
Faint, continuous to. 
3955 
2 
Continuous, strong to. 
3982 
Faint, continuous to. 
3955 
1 
Same as last. 
2 cub. centims. of the last solution diluted to 10 cub. centims. =1 in 1000. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous, strong to. 
3982 
Faint, continuous to. 
3917 
4 
Continuous, strong to. 
3891 
Faint, continuous to. 
3825 
3 
Continuous, strong to. 
3891 
Faint, continuous to. 
3825 
Faint line at. 
3788 
2 
Continuous, strong to. 
3891 
Weak, continuous to. 
3825 
Weak line at. 
3788 
i 
Continuous, strong to. 
3825 
Weak to. 
3742 
Faint line at. 
3673 
3 u 
mdccclxxxv. 
