508 
PROFESSOR W. N. HARTLEY OH THE 
0'1 grm. in 50 cub. centims. of alcohol of sp. gr. 0"8. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Strong, continuous to. 
2976-5 
4 
Strong, continuous to. 
2976-5 
3 
Strong, continuous to. 
2976-5 
2 
Strong, continuous to. 
2976-5 
1 
Strong’, continuous to. 
2976-5 
Faint, continuous to. 
2948 
2 cub. centims. of the last solution diluted to 10 cub. centims. =1 in 2500. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
Continuous to. 
2948 
Weak lines at. 
2863 
And . 
2836-5 
Trace of a line at. 
2740 
4 
Continuous to. 
2948 
Faint to. 
2740 
3 
Continuous to. 
2948 
Weak to. 
2740 
Faint line at. 
2701 
Absorption band . 
2740 to 2310 
Rays transmitted at. 
2310 
2 
Continuous to. 
2740 
Absorption band. 
2740 to 2310 
Rays transmitted from. 
2740 to 2701 
Also from (very faint). 
2352 to 2259 
1 
Continuous to. 
2740 
Absorption band. 
2568 to 2427-5 
Rays transmitted to. 
2259 
2 cub. centims. of the last solution diluted to 10 cub. centims. —1 in 12,500. 
Thickness of 
layer of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
5 
4 
3 
2 
1 
Continuous to. 
Absorption band. 
Rays transmitted to. 
Two very faint lines at.| 
Continuous to. 
Continuous to. 
Continuous to. 
Continuous to. 
2740 
2568 to 2427-5 
2259 
2493-5 
2482-5 
2259 
2259 
2259 
2193 
